Problema Solution
a cashier has $730 in twentyu-dollar bills and five dollar bills in all the cashier has 68 bills how manny twenty dolar bills does he have
Answer provided by our tutors
let x be number of twenty-dollar bills, y -- number of five dollar bills. Total number of them is 68, so we have: x+y=68
and total sum is 730, so we have 2nd equation: 730=20*x+5*y . We got system of equations with two equations:
730=20*x+5*y
x+y=68
y = 68-x
730=20*x+5*(68-x)
730=20*x+340-5*x
730-340=20*x-5*x
390=15*x
x=26
y=68-26=42