question_answer

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?

A) 2 : 3                             

B) 3 : 4  

C) 1 : 2     

D) 1 : 3

Correct Answer: C

Solution :

Given, stainless steel I II III

\[\therefore \]Required ratio \[=\frac{1}{78}:\frac{1}{39}=1:2\]