Answer:
4 parts of seltzer
Explanation:
The relation between 5 and 10, is 5 x 2
So you would have to multiply 2 by 2, is 2 x 2 = 4
Or set it up as a proportion
5 / 2 x 10 / x
Cross multiply
5x = 20
Divide
x = 20 / 5
x = 4
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