Problema Solution
Digital prints. Photo world charge $0.10 each for 4 by 6 prints and $0.60 each for 5 by 7 prints. Lucy orders 36 prints and pays $6.60 for her order. How many prints of each size did he order?
Answer provided by our tutors
let
x = the number of 4 by 6 prints
y = the number of 5 by 7 prints
Lucy orders 36 prints:
x + y = 36
and pays $6.60 for her order:
0.10x + 0.60y = 6.60 multiply both sides by 10
x + 6y = 66
by solving the system of equations:
x + y = 36
x + 6y = 66
we find:
x = 30 prints
y = 6 prints
click here to see the step by step solution of the system of equations:
Lucy ordered 30 prints 4 by 7 and 6 prints 5 by 7.