Question

A boy donated Rs 5 and a girl donated Rs 7 and all 15 students donated Rs 43. So what is the number of boys and girls?

Answer 1

Step-by-step explanation:

Rupees donated by 1 boy = Rs. 5

Rupees donated by 1 girl = Rs. 7

Let the number of boys be x and girls y.

Given that ,

x + y = 15

y = 15 - x

Also ,

(15- x )5 + (x) 7 = 43

75 - 5x + 7x = 43

2x = 43 - 75

x = 32 / 2

x = -16

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