Let the number be 'x'
one-fourth of the number = $$\frac{1}{4}\times x = \frac{x}{4}$$
one-third of one-fourth of the number = $$\frac{1}{3}\times \frac{x}{4} = \frac{x}{12}$$
Given, one-third of one-fourth of the number is = 15
$$\Rightarrow \frac{x}{12} = 15$$
$$\Rightarrow x = 180$$
Hence the number is 180.
Then three-tenth of the number = $$\frac{3}{10}\times x = \frac{3}{10}\times 180 = 54$$
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