Problema Solution
David has $18 in his coin bank, he saved his money in $1 coins and $2 notes, there is a total of 14 coins and notes, how many $1 coins and $2 notes does he have in the coin bank?
Answer provided by our tutors
let
x = the number of $1 coins
y = the number of $2 notes
David has $18 in his coin bank:
x + 2y = 18
there is a total of 14 coins and notes:
x + y = 14
by solving the system of equations:
x + 2y = 18
x + y = 14
we find:
x = 10
y = 4
click here to see the step by step solution of the system of equations:
David has 10 one dollar coins and 4 two dollars notes.