The Fast Fraction Aptitude Problem is as follows 
If one-fourth of one-third of a number is 15, then three-tenths of that number is ?
a). 35
b).36
c).45
d).54
The solution is given below :
EXPLANATION :
Say the number is “y”
So then one-fourth of one-third of that number will be (1/4) X (1/3) X y = (y/12)
But given that (y/12) = 15.
This implies that y = 12 X 15 = 180.
Now three-tenths of that number will be (3/10) X 180 = 54
Hence the answer is (d) 54
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