Question

a sum of Rs.800 is in the form of denominations of Rs.10 and Rs.20. if the total number of notes is 50. find the number of notes of each types

Answer 1

Let rupee10 notes be x
Then rs. 20 notes are 50-x
10x+20 (50-x)=800
10x+1000-20x=800
10x-20x=800-1000
-10x=-200
10x=200
x=200/10
x=20
rs. 10 notes are 20
rs. 20 notes are 50-20=30

Answer 2

Hi,

Here's your answer:-

In this question we can form it as simultaneous linear equation.

Let number of Rs.10 notes = x and Rs.20 notes = y

x+y = 50 --- (I)

10x + 20 y = 800

=> x+2y = 80--- (II)

Subtracting I from II,

x+2y = 80
x+y = 50
________
y = 30

Putting the value of y in I,

x+y = 50

=> x + 30 = 50

=> x = 20

So, number of Rs.10 notes = 20 and Rs.20 notes = 30

HOPE IT HELPS (^_^)