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A man can do a piece of work in 5 days, but with the help of his son, he can do it on 3 days How many days the son do it alone? |
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Answer» let, man=A and son=BA=5d and A+B=3dB=?we know that,time and work are inversely propertinali.e: A=2 days so A's work is 1/2now , A=1/5 and A+B=1/3use, A+B = A+B1/5+1/x=1/31/x=2/152x=15x= 7 1/2 or 7.5 |
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