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Ten years ago, Sarah was thrice as old as Mark. If Sarah is currently 40 years old, how old is MArk?

Solution

Ten years ago, Sarah was thrice as old as Mark. If Sarah is currently 40 years old, how old is MArk?

Solution

Mark^{'} s age is : 20

Solution steps

Translate the problem into an equation:

3 (x - 10) = 40 - 10

Solve for

x, 3 (x - 10) = 40 - 10 : x = 20

Mark^{'} s age is : 20

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