Question

Sandra has a cylindrical mold for making candles with a radius of 3.4 cm and a height of 6 cm. If Sandra uses a rectangular block of wax measuring 15 cm by 12 cm by 18 cm, about how many candles can she make after melting the block of wax?

Answer 1

`14\ candles`

Explanation:

step 1

Find the volume of the cylindrical mold

The volume is equal to

`V=\pi r^(2) h`

we have

`r=3.4\ cm`

`h=6\ cm`

assume

`\pi=3.14`

substitute

`V=(3.14)(3.4)^(2)(6)`

`V=217.79\ cm^(3)`

step 2

Find the volume of the wax

The volume is equal to

`V=(15)(12)(18)`

`V=3,240\ cm^(3)`

step 3

Divide the volume of the wax by the volume of the cylindrical mold, to calculate the number of candles

`3,240/217.79=14.9\ candles`

Round down

`14\ candles`