CASE STUDY QUESTION 47-Class X-Maths

CASE STUDY QUESTION 47-Class X-Maths

Aditya is celebrating his birthday. He invited his friends. He bought a packet of toffees/candies which contains 120 candies. He arranges the candies such that in the first row there are 3 candies, in second there are 5 candies, in third there are 7 candies and so on.

(a) Find the total number of rows of candies.
(i) 12 (ii) 10 (iii) 14 (iv) 8
Ans: (ii) 10

(b) How many candies are placed in last row?
(i) 22 (ii) 21 (iii) 24 (iv) 18

Ans: (ii) 21

(c) Find the difference in number of candies placed in 7th and 3rd row.
(i) 8 (ii) 10 (iii) 12 (iv) 14

Ans: (i) 8

(d) If Aditya decides to make 15 rows, then how many total candies will be placed by him with the same arrangement?
(i) 200 (ii) 150 (iii) 255 (iv) 210

Ans: (iii) 255

(e) Find the number of candies in 12^th row.
(i) 21 (ii) 30 (iii) 25 (iv) 19

Ans: (iii) 25