Question

it was expected that 10 men together would complete a piece of work in 40 days. but, after a few days, they increased their efficiency by 25% and completed work six days earlier. how many days after the start of work did they increase their efficiency?

Answer 1

Answer:

After 4 days

Step-by-step explanation:

It is inverse variation.

Let work done be x.

Now, 1/10 × x/4= 1/40

If work efficiency is increased by 25% then work is completed before 6 days i. e. 34 days.

Then, work done is 1/34.

So we get the eqn:

25%(1/10×10x/34)=1/34

x/136=1/34

•°• x=4 days