Question

Vinny has rs 45 in 50 paise coins.If the number of 25 paise coins is thrice the number of 50 paise coins, how many coins of each kind does she have?

Answer 1

Let Sumitra has 'x' 50-paise coins & 'y' 25-paise coins.
She has rs 34
So rs 1 = 100 paise
rs 34 = 34*100 = 3400 paise
50x + 25y = 3400 ----------- (1)
Given that , y = 2x ------------(2)
from equation (1) & (2) we get
50x + 25*(2x) = 3400
50x + 50x = 3400
100x = 3400
x = 34
From (2) we get
y = 2x = 2*34 = 68
So,
Number of 50-paise coins = 34
Number of 25-paise coins = 68

Answer 2

45x2= 90
90x3= 270
total coin 360.