Question

Working at a constant rate, a copy machine makes 20 copies of a one page document per minute. If the machine works at
this constant rate, how many hours does it take to make 4,800 copies of a one page document?​

Answer 1

Explanation:

If the copy machine can make 20 copies of a one-page document per minute, then it can make 20 x 60 = 1,200 copies per hour. So it will take 4,800/1,200 = 4 hours to make 4,800 copies.

Answer 2

Answer:

It takes 4 hours to make 4,800 copies of a one page. document

Explanation:

Here given,

a copy machine makes 20 copies of a one page document per minute.

Therefore, 20 copies take 1 minute.

Here we want to find time for making 4800 copies.

But now question is how can we find?

By Unitary method, easily we can find this.

For example,

If cost of 1 apple is 5 rupees

then by Unitary method,cost of 5 apple is (5×5) = 25 rupees.

Here a copy machine makes 20 copies of a one page document in 1 minute

By Unitary method,

The copy machine makes 1 copies of a one page document in $\frac{1}{20}$ minute.

The copy machine makes 4800 copies of a one page document in

$4800 \times \frac{1}{20} = 240 \: minutes$

We know,

$1 \: hour = 60 \: minutes$

So,240 minutes

$= \frac{240}{60} \\ = 4 \: hours$

Know more about Unitary method,

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