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In two types of stainless steel, the rat...

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`

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