Problema Solution
a sum of Rs 6.25 is made up of 80 coins which are either 10 paise coins and 5 paise coins.find the number of 5 paise coins.
Answer provided by our tutors
Rs 1.00 = 100 paise
Rs 6.25 = 625 paise
let
x = the number of 10 paise coins
y = the number of 5 paise coins
the total number of coins is 80
x + y = 80
the total value of the coins is Rs 6.25 = 625 paise thus
10x + 5y = 625
by solving the system of equations
x + y = 80
10x + 5y = 625
we find
y = 35 five paise coins
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