Question

100 Students contributed for a party, Some contributed ₹15 each And other contributed ₹25 each, if total amount collected was ₹2100. then how many Contributed ₹15 ?​

Answer 1

Answer:

Step-by-step explanation:

X be the boys  RS 15

Y be the boys  RS 25

From first condition,

15x + 25y = 2100.(1)

From second condition,

X+ Y = 100(2)

Multiplying equation 2 by 15

15X +15Y = 1500.

Subtracting equation 1 from 3

15X + 25Y= 2100

-

15X + 15Y = 1500

10Y= 600

Y= 60

And

Put Y = 60 in equation 2

X + 60 = 100

X = 40

Therefore,

40 students contribute RS 15