Question

A truck driver is carrying eleven bills. Some of the bills are

$10 bills (x), and some are $5 bills (y). Together, the bills
total $85. How many $10 bills does she have?

Answer 1

Answer:
6 ten-dollars bills

Explanation:

x + y = 11
10x + 5y = 85
5( x + y ) = 5(11)

5x + 5y = 55
10x + 5y = 85

-5x + 0 = -30

x = 6