Question

1. If 25 men can do a piece of work in 15 days, then in how many days will 5 men complete the same work?​

Answer 1

Step-by-step explanation:

According to the problem, we are given that 15 men can do a piece of work in 20 days. We need to find the number of days that this work can be finished by 25 men.

Let us assume the piece of work be ‘x’ and the part of the work done by each man per day be ‘y’.

Let us now find the amount of work done by 15 men in a single day, which is 15×y=15y

So, we have 20×15y=x .

⇒300y=x .

⇒y=

x

300

.

Now, let us find the amount of work done by 25 men in a single day.

We get 25×y=25×

x

300

=

x

12

.

Now, let us assume the number of days required for 25 men to finish the work be ‘n’.

So, we get n×

x

12

=x .

⇒n=12 .

So, we have found the number of days required for 25 men to finish the work as 12 days.

∴, The correct option for the given problem is (a).

Answer 2

Step-by-step explanation:

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