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1. 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

Solution:

According to the question,

\begin{matrix} Chromium Steel \\ Type 1 2 : 11 \\ Type 2 5 : 21 \end{matrix}

Now using alligation,
Alligation mcq solution image

Ratio of quantity \to 1 : 2

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