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 become 7: 32? |
[SSC (10+2) 2017]. |
A) 1 : 2
B) 1 : 3
C) 2 : 3
D) 3 : 4
Correct Answer: A
Solution :
Ratio of chromium in type I steel \[=\frac{2}{13}\] |
Ratio of chromium in type II steel \[=\frac{5}{26}\] |
Ratio of chromium in mixed steel \[=\frac{7}{39}\] |
The required ratio |
So, the required ratio \[=\,\,\,\frac{\frac{1}{78}}{\frac{1}{39}}\,\,=\,\,1:2\] |
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