Question

A tank holds 6.90 m3 of water. What is the volume in ft3? (3.28 ft = 1 m, Remember significant figures, but this answer does not need units, since the answer must be in ft3)

Answer 1

Volume of tank = $6.9 m^{3}$ (given)

Since, $1 m = 3.28 ft$

So,  

$1 m^{3} = 35.287 ft^{3}$

For $6.9 m^{3}$:

$6.9\times 35.287 ft^{3} = 243.4803 ft^{3}$

The significant rule for multiplication, states that the number of significant figures in the answer obtained by multiplication is determined by the value with the lowest number of significant digits.

Since, the minimum number of decimal places in the above multiplication operation is 1 so, the final result must be upto 1 decimal place only.

$243.4803 ft^{3} \simeq 243.5 ft^{3}$

Hence, volume in $ft^{3}$ is 243.5.