Problema Solution
Bob has five centavo and twenty-five centavo-coins that total P4.20. He has twice as many five-centavo coins as twenty -five coins. How many twenty-five centavo coins has BOb?
Answer provided by our tutors
let
x = the number of five centavo coins
y =the number of twenty-five centavo coins
He has twice as many five-centavo coins as twenty -five coins
x = 2y
the total money he has is 4.20 = 420 centavo
5x + 25y = 420 divide both sides by 5
x + 5y = 84
by solving the system of equations
x = 2y
x + 5y = 84
we find
x = 24 coins
y = 12 coins
click here to see the step by step solution of the system of equations
Bob has 24 five centavo and 12 twenty-five centavo coins.