NIELIT 2016 DEC Scientist B - Section A: 53

Question

$1/4$th of $60\%$ of a number is equal to $2/5$th of $20\%$ of another number. What is the respective ratio of the first number to that of second number?

• A. $8:15$
• B. $5:9$
• C. $8:13$
• D. $4:7$

Answer 1

Let the first number  is $x$ and the second number is $y.$

Now, $\dfrac{1}{4} \times \dfrac{60}{100}  \times x = \dfrac{2}{5} \times \dfrac{20}{100}  \times y$

$\implies 15x = 8y$

$\implies \dfrac{x}{y} = \dfrac{8}{15}$

Hence, the respective ratio of the first number to that of second number $ = 8:15.$

So, the correct answer is $(A).$

Answer 2

Let $1^{st}$ number is $x$ and $2^{nd}$ number is $y.$

$\Rightarrow$ $\text{($\frac{1}{4}$ * ($60$%)*x})$ $=$ $\textrm{($\frac{2}{5}$ * ($20$%)*y)}$

$\Rightarrow$ $\text{$(\frac{60}{400}$)* x}$ $=$ $\textrm{$(\frac{40}{500}$)* y}$

$\Rightarrow$ $\frac{x}{y}$  $=$ $\frac{8}{15}$

So the ratio of the first number to that of the second number is= $8:15$

Option $A$ is correct here.