Question

Lea made two candles in the shape of right rectangular prisms. The first candle is 15 cm high, 8 cm long, and 8 cm wide. The second candle is 5 cm taller but has the same length and width. How much additional wax was needed to make the taller candle?

Answer 1

256 cm more, because 8•8 or length • width =64•4 or how much more layers cm you need to add on is 256 to make it 5 cm taller in height.

Answer 2

Volume of the first- (15)(8)(8)=960cm cubed
Volume of the second-(20)(8)(8)=1280
Difference=320
320 cm cubed were needed to make the taller candle