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Six years ago, Sally was 12 years younger than thrice her sister's age. How old is Sally if she is twice as old as her sister now?

Solution

Six years ago, Sally was 12 years younger than thrice her sister's age. How old is Sally if she is twice as old as her sister now?

Solution

Sally^{'} s age is : 48

Solution steps

Translate the problem into an equation:

2 x - 6 + 12 = 3 (x - 6)

Solve for

x, 2 x - 6 + 12 = 3 (x - 6) : x = 24

Find Sally's age

: 48

Sally^{'} s age is : 48

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