NIELIT 2023 Feb Scientist D | Section D | Question: 112

Question

The ratio of water and milk in a $30$-litre mixture is $7: 3$. Find the quantity of water to be added to the mixture in order to make the ratio $6: 1$.

• A. $30$
• B. $32$
• C. $35$
• D. $33$

   

Answer 1

Total quantiy of mixture=$30$ liter

ratio of water:milk=$7:3$

So a quantity of water in the mixtrue=$\frac{7}{10}*30=21$ liter

quantity of milk in the mixture=$\frac{3}{10}*30=9$ liter

Let $x$ liter of water be added so the new mixture :

$\frac{21+x}{9}=\frac{6}{1}$

$\implies21+x=54$

$\implies x=33$ liter

Option $(D)$ is correct.