Chris had $4 in cash, with which he purchased coffee for $0.79, a bag of chips for $1.69 and a lottery ticket for $1.00. If he does not have to pay sales tax, how much change should he receive?

If you add the money that Chris has used, and subtract it from his total, you will get the amount that Chris has left in change.

0.79 + 1.69 + 1.00 = 3.48

4.00 - 3.48 = 0.52

Chris has 52 cents left in change.

I hope this helps!

i assume that by 5 you mean 5 gallons.

(20)(0.25) = 15

removing 15 gallons reduces the tank from 20 to 5.