Question

a boy had 12 coins, they were made of 2 rupees coins and one rupee coins altoghether he had rs 16, how many 2 rupees coins did he have​

Answer 1

Step-by-step explanation:

Question reduces to all possible solutions of

2x + 5y = 120 (where x,y are positive integers)

x = 60 - 5y/2

Points to note:

1. y should be an even number to ensure x is an integer.

2. Minimum value of y is 0

3. Let's try to find max y by setting x to 0

60 = 5y/2

y = 24

So y can be all even numbers till 24 including 0.

So total 13 solutions.