First of all, we need to find the volume of the rectangular prism with the information we're given:
L: 7cm
W: 2cm
H: 10cm
Formula (prism volume):
V = whl → V = (2)(7)(10) → V = (14)(10) → V = 140
Now, we divide the total volume of candles (wax) produced by the amount of wax that 1 candle contains, that way, we will find the number of candles produced:
If one brother is 31 and the other is 30, it would equal 61 which is older than their father. This keeps the brothers one year apart. The answer would be 31