Jack went to a supermarket with $100 and bought 4 bottles of water. Then his mother called him and asked him to buy twice as many bottles as he already bought. Each bottle cost $2. Finally, he also bought half a pound of cheese and 1 pound of cheese costs $10. How much money does Jack have remaining?
Jack's mother asked him to buy 2 * 4 = <T>multiply(2, 4)=8 bottles of water.
Thus Jack bought 4 + 8 = <T>add(4, 8)=12 bottles of water in total.
Altogether, the bottles of water cost 12 * $2 = $<T>multiply(12, 2)=24
The cheese cost 1/2 * $10 = $<T>multiply(10, 0.5)=5.0
So Jack spent $24 + $5 = $<T>add(24, 5)=29 on water and cheese.
Since he started with $100, he now has $100 - $29 = $<T>subtract(100, 29)=71 left.
