Question

11       12       13       14     A customer buys 17.01 in gas and requests one five dollar [$5] lottery ticket, two one dollar [$1] lottery tickets, and one [$3] lottery ticket. He gives you two winning tickets to be redeemed: one for ($5) and the other for ($2). How much change would he receive from a $100 bill?*

Answer 1

The customer gave me:
-- a ticket worth $5
-- a ticket worth $2
-- a bill worth $100
Total. . . . . . .$107

I gave him:
-- some gas worth $17.01
-- a ticket worth $ 5
-- two $1 tickets $ 2
-- a ticket worth $ 3
Total. . . . . . . .$27.01

The total value of everything we trade has to be equal.

I owe him ( $107.00 - $27.01 ) = $79.99 in change