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Andrei is 6 years older than his sister Andrea. After 10 years, the sum of their ages will be 50. How old is Andrea?

Solution

Andrei is 6 years older than his sister Andrea. After 10 years, the sum of their ages will be 50. How old is Andrea?

Solution

Andrea^{'} s age is : 12

Solution steps

Translate the problem into an equation:

x + 10 + x - 6 + 10 = 50

Solve for

x, x + 10 + x - 6 + 10 = 50 : x = 18

Find Andrea's age

: 12

Andrea^{'} s age is : 12

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