Question

a sum of Rs 800 is in the form of denominations if Rs 10and 20 if the total no of are Rs50, find the no of notes of each type

Answer 1

let the no. of 10 rs note be x a d 20 rs be y
x+y=50
10x+20y=800
x+2y=80
from this y=30 and x=20

Answer 2

Let the no. of Rs.10 notes be x
therefore,no. of Rs.20 notes are x-50
10x+20(x-50)=800
10x+20x-1000=800
30x=800+1000
30x=1800
x=1800/30=60
Therefore, no. of Rs. 10 notes= 60
No. of Rs. 20 notes=60-50=10