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16 men can finish a work in 12 days. After they worked for 4 days, some more men joined them and they together completed the remaining work in 4 days. How many more men joined in?
1. 8
2. 16
3. 32
4. 10

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Correct Answer - Option 2 : 16

Given:

Initial number of men = 16

Initial time is to be needed = 12

Formula used:

M1D1/W1 = M2D2/W2

Where,

M1 = Men , D1 = Days1 

M2 = Men2 , D2 = Days2 

W1 = Work , W2 = Work2

Calculation:

Total work = 16 × 12 = 192

Work completed = 16 × 4 = 64

Remaining work = 192 – 64 = 128

This work is to be completed in 4 days

So number of worker required = 128/4 = 32

No of more men required is 32 – 16 = 16

∴ So 16 more men is required.

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