An Artisan has 63 kg of metal of

Question

density 7,000kg/m3. He intends to
use make a rectangular pipe with
external dimensions 12 cm by 15
cm and internal dimensions 10 cm
by 12 cm. Calculate the length of
the pipe in meters.

Answer 1

so he has 63/7000 m^3
and 1 m^3 is 100^3 cm^3

so he has 63/7000 * 1000000 cm^3
or 9000 cm^3 available

let the length be h
area of cross-section
= 12(15) - (10)(12) = 60 cm^2

60h = 9000
h = 150 cm long or 1.5 m