Question

the inner diameter of a wooden cylindrical pipe is 24cm and its outer diameter is 28cm the length of the pipe is 35cmfind the mass of the pipe if 1cm cube of wood has mass 3g

Answer 1

the mass of the pipe is 1.92 kg.

Answer 2

$22 \div 7 \times 14 \times 14 \times 35$
$22 \ \times 14 \times 14 \times 5$
$1540 \times 14$
$21560$
Now

$22 \div 7 \times 144 \times 35$
$22 \times 144 \times 5$
$110 \times 144$
$15840$
$21560 - 15840$
$= 5720$
since 1 cu.cm = 3g
$5720 \times 3 \\ = 17160g$