Question

A student can type 21 pages in 15 minute. At the same rate, how long will it take the student to type 84 pages?

Answer 1

Answer:

it will take 60 ninute to type 84 pages

Given:-

• A student can type 21 pages in 15 minute

To find:-

• how log it will take the student to typle 84 pages .

Solution:-

aa we can see

let assume

time take for 84 pages will be X

$pages \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: minute \\ \: \: \: 21 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: 15 \\ \: \: 84 \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: \: x \\ \\ cross \: \: multiply \: this \\ \\ 21 \times x = 15 \times 84 \\ \\ x = \frac{15 \times 84}{21} \\ \\ x = 60$

Answer 2

The time take the student to type 84 pages = 60 minutes or 1 hour

Step-by-step explanation:

A student can type 21 pages = 15 minute

To find, the time take the student to type 84 pages = ?

∵ A student can type 21 pages = 15 minute

∴ A student can type 1 page = $\dfrac{15}{21}$ minute

The time take the student to type 84 pages = $\dfrac{15}{21}$ × 84 minute

= 15 × 4 minutes

= 60 minutes or 1 hour

Thus, the time take the student to type 84 pages = 60 minutes or 1 hour