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leva [86]
3 years ago
5

The age difference between

Mathematics
1 answer:
Jet001 [13]3 years ago
7 0

9514 1404 393

Answer:

  15 and 21

Step-by-step explanation:

I like to work these considering the difference in ratio units.

The age ratio is 5 : 7.

The age difference in ratio units is 7 - 5 = 2. The difference in years is 6, so each ratio unit must be 6/2 = 3 years. Multiplying the ratio numbers by 3, we get the actual ages as ...

  5 : 7 = (3·5) : (3·7) = 15 : 21

The two sisters are 15 and 21 years old.

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