AnnaChen AnnaChen

01-07-2020
Mathematics

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SvetkaChem SvetkaChem

01-07-2020

Answer:

a. 13

Step-by-step explanation:

x - youngest sister

x + 1 - middle sister

x + 1 + 1 - oldest sister

x + x + 1 + x + 1 + 1 = 39

3x + 3 = 39

3x = 36

x = 12

x+ 1 = 12 + 1 = 13

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