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mark is four years younger than robert. Twenty years ago, mark was thirteen years more than half the age of Robert. How old are they now

Solution

mark is four years younger than robert. Twenty years ago, mark was thirteen years more than half the age of Robert. How old are they now

Solution

Mark^{'} s age is : 50

Robert^{'} s age is : 54

Solution steps

Translate the problem into an equation:

x - 20 = 13 + \frac{1}{2} (x + 4 - 20)

Solve for

x, x - 20 = 13 + \frac{1}{2} (x + 4 - 20) : x = 50

Find age

Mark^{'} s age is : 50

Robert^{'} s age is : 54

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