Question

One-third of one half of one-fifth of a number is $15$ then the number is

• A. $50$
• B. $150$
• C. $15$
• D. $450$

Answer 1

The correct option is D $450$

Let the no. is $x$

One-third of one half of one fifth of $x$ is $15$

That is,

$\frac{1}{3}$ of $\frac{1}{2}$ of $\frac{1}{5}$ of $x=15$

$\frac{1}{3}\times \frac{1}{2}\times \frac{1}{5}\times x=15$

$\frac{1}{30}\times x=15$

$x=15\times 30=450$