A work can be completed by 'N' men in 15 days. 5 men leave the work after 3 days. The remaining work was completed in 18 days. What is the value of 'N'?
$$men_1\times\ days_1\ =\ men_2\times\ days_2$$
$$N\times15 =Â N\times3+(N-5)\times18$$
15N = 3N+18N-90
15N = 21N-90
21N-15N =Â 90
6N = 90
N = 15
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