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If one-third of one-fourth of a number is 15, then three-tenth of that number is:

Options:
A .  35
B .  36
C .  45
D .  54
Answer: Option D

Let the number be x.


Then, \(\frac{1}{3} of \frac{1}{4} of x = 15 \Leftrightarrow x = 15\times12 = 180.\)


So, required number = \(\left(\frac{3}{10}\times180\right) = 54\)


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