Question

A stamping machine can stamp 40 envelopes in 8 minutes. How many of stamping machines, working at the same time, are required to stamp 120 envelopes per minute?

Answer 1

Given:

A stamping machine can stamp 40 envelopes in 8 minutes.

That means in one minute the number of envelopes stamp by machine is,

$\frac{40}{8}=5\text{ envelopes per minute}$

The machine required to stamp 120 envelopes per minute is,

$\frac{120}{5}=24\text{ machines}$

Answer: 24 machines will required to stamp 120 envelopes per minute.