Given:
A stamping machine can stamp 40 envelopes in 8 minutes.
That means in one minute the number of envelopes stamp by machine is,
[tex]\frac{40}{8}=5\text{ envelopes per minute}[/tex]The machine required to stamp 120 envelopes per minute is,
[tex]\frac{120}{5}=24\text{ machines}[/tex]Answer: 24 machines will required to stamp 120 envelopes per minute.
