If 13 men can complete a piece of work in 36 days, then in how many days will 18 men complete the same work?
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Solution:
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We can solve this problem using Unitary Method. It should be clear that there is an inverse relation between men engaged and the time taken to complete any piece of work.
13 men complete the work in = 36 days
1 man will complete the same work in = 36 x 13 ....( inverse relation)
18 men will complete the same work in = (36 x 13) ÷ 18 = 26
So, the required answer is 26 days.
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sanat186:
what is inverse relation
Inverse relation - an increase in one quantity or value causes decrease in the other quantity or value.. For example.. More men.. Less days.. Less men
Less men... More days
So, in Unitary method we change the operation also.. Where we divide the quantities... We. Do multiplication there.. And vice versa
In the solution we have written 36 ×13..but if it had been a direct relation.. Then we wouod have written 36÷13
ok
Direct relation - increase in one quantity leads to increase in other quantity.. Fir example...buyung more chocolates... Paying more money.....
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