Question

Jhon mows 40% of the lawn in 20 minutes how much time does he need to finish the mowing lawn?

Answer 1

If John mows 40% of the lawn in 20 minutes, we can first find out how long it takes him to mow 100% of the lawn.

To find the time for 100%, we can use the following proportion:

\[
\text{Time for 40%} : \text{Time for 100%} = 40 : 100
\]

This means:

\[
\frac{20 \text{ minutes}}{x \text{ minutes}} = \frac{40}{100}
\]

Cross-multiplying gives:

\[
40x = 20 \times 100
\]

\[
40x = 2000
\]

Now, divide both sides by 40:

\[
x = \frac{2000}{40} = 50 \text{ minutes}
\]

Thus, it takes John 50 minutes to mow the entire lawn. Since he has already mowed 40% of the lawn in 20 minutes, he has 60% left.

To find out how much time is needed to mow the remaining 60%, we calculate:

\[
\text{Time for 60%} = 60\% \text{ of total time} = 0.6 \times 50 \text{ minutes} = 30 \text{ minutes}
\]

Therefore, John needs an additional **30 minutes** to finish mowing the lawn.