Question

Tomas bought a bottle of shampoo that held 10.5 fluid ounces.He uses 1/2 of the shampoo every time he washes his hair.How many ounces of the shampoo are left after he washes his hair 2 times?

Answer 1

Amount of shampoo in the bottle = 10.5 ounces or
`10(1)/(2)=(21)/(2)`

Shampoo used in each wash =
`(1)/(2)`

So after 1st wash shampoo left is =

`(21)/(2)-(1)/(2)=(20)/(2)=10` ounces

Shampoo left after 2nd wash =
`10-(1)/(2)=(19)/(2)` ounces

or 9.5 ounces are left after washing the hair 2 times.