Sarah is 46.
n = Tonya’s age
2n + 10 = Sarah’s age
2n + 10 + n = 64
3n + 10 = 64
3n - 10 = 64 - 10
3n = 54
3n/3 = 54/3
n = 18
18 x 2 = 36
36 + 10 = 46
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