In two types of stainless steel, the ratio of chromium and steel are 2 : 11 and 5 : 21 respectively. In what proportion should the two types be mixed so that the ratio of chromium to steel in the mixed type becomes 7 : 32 ?

Answer: Option C

Solution

Answer: Option C

Solution:

According to the question,
$$\begin{array}{c}\text{Chromium}\text{Steel}\text{hfill}\\ \text{Type 1}2:11\text{hfill}\\ \text{Type 2}5\text{:}21\text{hfill}\end{array}$$
Now using alligation,

$$\text{Ratio of quantity }\to \boxed{1:2}$$