Answers

2014-11-16T14:38:34+05:30
If 
18 men -= 35 days
then
a men = 15 days

so 
x - 18 men - a men
y -  35 days - 15 days
 
i.e. 18x35 = 15 a
then
a = 42
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2014-11-16T17:43:56+05:30
18 men = 35 days
x          = 15 days

x-18 men-a men
y-35 days-15 days
Here, according to problem 15 a= 18*35
a=18*35/15=6*7=42
Therefore, 42 men are required to reap the field in 15 days
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