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If 10 men or 20 women or 40 children can...

If 10 men or 20 women or 40 children can do a piece of work in 7 months, then 5 men, 5 women and 5 children together can do half of the work in :

A

4 month /4 महीने

B

5 month /5 महीने

C

8 month /8 महीने

D

6 month/6 महीने

Text Solution

Verified by Experts

The correct Answer is:
A
`E_M=1/(10xx7), E_W =1/(20xx7) , E_C =1/(40xx7) E_M +E_W +E_C =1/7 (1/10 +1/20+1/40)=1/7 ((4+2+1)/40)=(1/40)`
`:. 5(E_M +E_W+E_C)=5xx1/40=1/8`
अत: 5 बच्चे, 5 औरत तथा 5 आदमी मिलकर पुरा काम 8 महीने में । करेंगे।
`:.` आधा कार्य करने में लगा समय = 4 माह
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