A father can do a job as fast as his two sons working together. If one son does the job in 3 hours and the other in 6 hours, how many hours does it take the father to do the job?.
1) 1
2) 2
3) 3
4) 4
If 10 men or 18 boys ...
A father can do a job ...
25 men with 10 boys can do in 6 days as much work as 21 ...
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[Analogies]
OXYGEN : GASEOUS : : 1. feather : light 2. mercury : fluid ...
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[Analogies ]
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