Question

If 7 men work on a piece of land in 5 days how long will it take 5 men to work on the same rate

Answer 1

Its a simple unitary method problem…

6 men will do the work in 12 days

1 man will do in 6*12 = 72 days

So, 5 men will do it in 72/5 = 14.4 days

There are two types of relation

Direct relation - If one quantity increases then the other also increases and if one quantity decreases then the other also decreases.

Example- If 3 pencils cost Rs 7, then what will be the cost of 5 pencils ?

3 pencils cost Rs 7

1 pencil will cost Rs 7/3 (First divide)

5 pencils will cost Rs (7/3)*5 = Rs 11.66 (Then Multiply)

Inverse relation : If one quantity increases then the other decreases and if one quantity decreases then the other increases.

Example - This question itself is the example of inverse relation. Here first we did multiplication and then division.

I hope it clears the image….

Answer 2

7 men will do the work in 5 days
1 man will do 7*5=35

so 5 men 
35/5 = 7 days

have a nice day!