**Ex 5.3 Class 10 Maths Question 1.**

Find the sum of the following APs:

(i) 2, 7, 12,…… to 10 terms.

(ii) -37, -33, -29, …… to 12 terms.

(iii) 0.6, 1.7, 2.8, ……, to 100 terms.

**Solution for Ex 5.3 Class 10 Maths Question 1**

**Solution for Ex 5.3 Class 10 Maths Question 1**

**Ex 5.3 Class 10 Maths Question 2.**

Find the sums given below:

(ii) 34 + 32 + 30 + … + 10

(iii) -5 + (-8) + (-11) + ….. + (-230)

**Solution for Ex 5.3 Class 10 Maths Question 2**

**Solution for Ex 5.3 Class 10 Maths Question 2**

**Ex 5.3 Class 10 Maths Question 3.**

In an AP:

(i) given a = 5, d = 3, a_{n} = 50, find n and S_{n}.

(ii) given a = 7, a_{13} = 35, find d and S_{13}.

(iii) given a_{12} = 37, d = 3, find a and S_{12}.

(iv) given a_{3} = -15, S_{10} = 125, find d and a_{10}.

(v) given d = 5, S_{9} = 75, find a and a_{9}.

(vi) given a = 2, d = 8, S_{n} = 90, find n and a_{n}.

(vii) given a = 8, a_{n} = 62, S_{n} = 210, find n and d.

(viii) given a_{n} = 4, d = 2, S_{n} = -14, find n and a.

(ix) given a = 3, n = 8, S = 192, find d.

(x) given l = 28, S = 144, and there are total 9 terms. Find a.

**Solution for Ex 5.3 Class 10 Maths Question 3**

**Solution for Ex 5.3 Class 10 Maths Question 3**

**Ex 5.3 Class 10 Maths Question 4.**

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

**Solution for Ex 5.3 Class 10 Maths Question 4**

**Solution for Ex 5.3 Class 10 Maths Question 4**

**Ex 5.3 Class 10 Maths Question 5.**

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.

**Solution for Ex 5.3 Class 10 Maths Question 5**

**Solution for Ex 5.3 Class 10 Maths Question 5**

**Ex 5.3 Class 10 Maths Question 6.**

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?

**Solution for Ex 5.3 Class 10 Maths Question 6**

**Solution for Ex 5.3 Class 10 Maths Question 6**

**Ex 5.3 Class 10 Maths Question 7.**

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

**Solution for Ex 5.3 Class 10 Maths Question 7**

**Solution for Ex 5.3 Class 10 Maths Question 7**

**Ex 5.3 Class 10 Maths Question 8.**

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

**Solution for Ex 5.3 Class 10 Maths Question 8**

**Solution for Ex 5.3 Class 10 Maths Question 8**

**Ex 5.3 Class 10 Maths Question 9.**

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.

**Solution for Ex 5.3 Class 10 Maths Question 9**

**Solution for Ex 5.3 Class 10 Maths Question 9**

**Ex 5.3 Class 10 Maths Question 10.**

Show that a_{1}, a_{2}, ……. a_{n},…… form an AP where an is defined as below:

(i) a_{n} = 3 + 4n

(ii) a_{n} = 9 – 5n

Also find the sum of the first 15 terms in each case.

**Solution for Ex 5.3 Class 10 Maths Question 10**

**Solution for Ex 5.3 Class 10 Maths Question 10**

**Ex 5.3 Class 10 Maths Question 11.**

If the sum of the first n terms of an AP is 4n – n^{2}, what is the first term (that is S_{1})? What is the sum of first two terms? What is the second term? Similarly, find the 3rd, the 10th and the nth terms.

**Solution for Ex 5.3 Class 10 Maths Question 11**

**Solution for Ex 5.3 Class 10 Maths Question 11**

**Ex 5.3 Class 10 Maths Question 12.**

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

**Solution for Ex 5.3 Class 10 Maths Question 12**

**Solution for Ex 5.3 Class 10 Maths Question 12**

**Ex 5.3 Class 10 Maths Question 13.**

Find the sum of the first 15 multiples of 8.

**Solution for Ex 5.3 Class 10 Maths Question 13**

**Solution for Ex 5.3 Class 10 Maths Question 13**

**Ex 5.3 Class 10 Maths Question 14.**

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

**Solution for Ex 5.3 Class 10 Maths Question 14**

**Solution for Ex 5.3 Class 10 Maths Question 14**

**Ex 5.3 Class 10 Maths Question 15.**

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?

**Solution for Ex 5.3 Class 10 Maths Question 15**

**Solution for Ex 5.3 Class 10 Maths Question 15**

**Ex 5.3 Class 10 Maths Question 16.**

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.

**Solution for Ex 5.3 Class 10 Maths Question 16**

**Solution for Ex 5.3 Class 10 Maths Question 16**

**Ex 5.3 Class 10 Maths Question 17.**

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, eg. 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?

**Solution for Ex 5.3 Class 10 Maths Question 17**

**Solution for Ex 5.3 Class 10 Maths Question 17**

**Ex 5.3 Class 10 Maths Question 18.**

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 figure. What is the total length of such a spiral made up of thirteen consecutive semicircles?

(Take π = 22/7)

[Hint: Length of successive semicircles is l_{1}, l_{2}, l_{3}, l_{4}, … with centres at A, B, respectively.]

**Solution for Ex 5.3 Class 10 Maths Question 18**

**Solution for Ex 5.3 Class 10 Maths Question 18**

**Ex 5.3 Class 10 Maths Question 19.**

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 Figure). In how many rows are the 200 logs placed and how many logs are in the top row?

**Solution for Ex 5.3 Class 10 Maths Question 19**

**Solution for Ex 5.3 Class 10 Maths Question 19**

**Ex 5.3 Class 10 Maths Question 20.**

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

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?

**Solution for Ex 5.3 Class 10 Maths Question 20**

**Solution for Ex 5.3 Class 10 Maths Question 20**