Question

16. A sum of 500 is in the form of denominations of ₹ 5 and ₹ 10. The total number of notes is 90, find the number of notes of each type.​

Answer 1

Answer:

x = 80 , y = 10

Step-by-step explanation:

let the number of 5 rupees notes = x

let number of 10 rupees notes be = y

A.T.Q.

x + y = 90 ------(1)

5x + 10y = 500 -------(2)

from -----(1)

x = 90-y -----(3)

put  (3) into (2)

5(90-y) +10 y = 500

450-5y + 10y = 500

5y =50

y = 10

x + y = 90

x + 10 = 90

x =90 - 10

x = 80