Question 79

There are 50 paise and 25 paise coins in a bag whose value is Rs.45. If the total numberof coins is 100, then the number of 50 paise coins is


let we have x number of 50 paise cion and y number of 25 paise coin 

then given 

$$x\cdot\frac{1}{2}+y\cdot\frac{1}{4}=45$$ and x + y = 100 

on solving both equation we get 

x = 80 and y = 20 

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