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NCERT 10th Maths

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

A small terrace at a football ground comprises of 15 steps each of which is 50 m long and built of solid concrete. Each step has a rise of \frac{1}{4} m and a tread of \frac{1}{2} m. (see in below Fig). Calculate the total volume of concrete required to build the terrace.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

A ladder has rungs 25 cm apart. (see in below Fig). The rungs decrease uniformly in length from 45 cm at the bottom to 25 cm at the top. If the top and the bottom rungs are 2\frac{1}{2} m apart, what is the length of the wood required for the rungs?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

The houses of a row are numbered consecutively from 1 to 49. Show that there is a value of x such that the sum of the numbers of the houses preceding the house numbered x is equal to the sum of the numbers of the houses following it. Find this value of x. [Hint: S_{x-1} = S_{49} -S_x]

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

The sum of the third and the seventh terms of an AP is 6 and their product is 8. Find the sum of first sixteen terms of the AP.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Which term of the AP: 121, 117, 113, …, is its first negative term? [Hint: Find n for a_n <0]

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

In a potato race, a bucket is placed at the starting point, which is 5 m from the first potato, and the other potatoes are placed 3 m apart in a straight line. There are ten potatoes in the line (see in Fig). A competitor starts from the bucket, picks up the nearest potato, runs back with it, drops it in the bucket, runs back to pick up the next potato, runs to the bucket to drop it in, and she continues in the same way until all the potatoes are in the bucket. What is the total distance the competitor has to run?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

200 logs are stacked in the following manner: 20 logs in the bottom row, 19 in the next row, 18 in the row next to it and so on (see Fig.). In how many rows are the 200 logs placed and how many logs are in the top row?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

A spiral is made up of successive semicircles, with centres alternately at A and B, starting with centre at A, of radii 0.5 cm, 1.0 cm, 1.5 cm, 2.0 cm, . . . as shown in Fig. What is the total length of such a spiral made up of thirteen consecutive semicircles?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

In a school, students thought of planting trees in and around the school to reduce air pollution. It was decided that the number of trees, that each section of each class will plant, will be the same as the class, in which they are studying, e.g., a section of Class I will plant 1 tree, a section of Class II will plant 2 trees and so on till Class XII. There are three sections of each class. How many trees will be planted by the students?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

A sum of Rs 700 is to be used to give seven cash prizes to students of a school for their overall academic performance. If each prize is Rs 20 less than its preceding prize, find the value of each of the prizes.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

A contract on construction job specifies a penalty for delay of completion beyond a certain date as follows: Rs 200 for the first day, Rs 250 for the second day, Rs 300 for the third day, etc., the penalty for each succeeding day being Rs 50 more than for the preceding day. How much money the contractor has to pay as penalty, if he has delayed the work by 30 days?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Find the sum of the odd numbers between 0 and 50.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Find the sum of the first 15 multiples of 8.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Find the sum of the first 40 positive integers divisible by 6.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

If the sum of the first n terms of an AP is 4n - n^2, what is the first term (that is S1)? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Show that a_1, a_2, ..., a_n, ... form an AP where a_n is defined as a_n =9-5n. Also find the sum of the first 15 terms.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Show that a_1, a_2, ..., a_n, ... form an AP where a_n is defined as a_n =3+4n. Also find the sum of the first 15 terms.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

If the sum of first 7 terms of an AP is 49 and that of 17 terms is 289, find the sum of first n terms.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Find the sum of first 51 terms of an AP whose second and third terms are 14 and 18 respectively.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

Find the sum of first 22 terms of an AP in which d = 7 and 22nd term is 149.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

The first and the last terms of an AP are 17 and 350 respectively. If the common difference is 9, how many terms are there and what is their sum?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

The first term of an AP is 5, the last term is 45 and the sum is 400. Find the number of terms and the common difference.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

How many terms of the AP: 9, 17, 25, … must be taken to give a sum of 636 ?

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

In an Ap: given l = 28, S = 144, and there are total 9 terms. Find a.

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eduhilfe
Asked: June 9, 2020In: NCERT 10th Maths

In an Ap: given a = 3, n = 8, S = 192, find d.

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