Question

In a particular metal mixture there are:

1 part mercury to 5 parts copper,
3 parts tin to 10 parts copper,
You would need how many parts mercury to how many parts tin?

A) 1:3
B) 2:3
C) 6:13
D) 4:15

Answer 1

B) 2:3

Explanation:

If you have mercury : copper = 1 : 5 and tin : copper = 3 : 10, you want the ratio of mercury to tin.

Ratio

The ratios can be compared or combined when common components are represented by the same number. Doubling the values in the first ratio, we will have two ratios that both have 10 parts copper.

mercury : copper = 1 : 5 = 2 : 10

Then ...

mercury : tin : copper = 2 : 3 : 10

You need 2 parts mercury to 3 parts tin.

mercury : tin = 2:3 . . . . . . choice B

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