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Suppose the ratio of Lev's age to Mina's age is 1 : 2 and the ratio of Mina's age to Naomi's age is 3 : 4.

If the sum of all three ages is between 10 and 20, then how old is Mina?

 Apr 3, 2021
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Lev's age = L

Mina's age = M

Naomi's age = N

\(\frac{L}{M}=\frac{1}{2}=\frac{3}{6}\) => \(\frac{M}{N}=\frac{3}{4}=\frac{6}{8}\)

L = 3a

M = 6a

N = 8a

a = 1 

M = 6

 Apr 4, 2021

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