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Kathy is 7 years younger than Brian. The sum of their ages is 84. How old is Brian?

Solution

Kathy is 7 years younger than Brian. The sum of their ages is 84. How old is Brian?

Solution

Brian^{'} s age is : 45 \frac{1}{2}

Solution steps

Translate the problem into an equation:

x + x + 7 = 84

Solve for

x, x + x + 7 = 84 : x = \frac{77}{2}

Find Brian's age

: 45 \frac{1}{2}

Brian^{'} s age is : 45 \frac{1}{2}

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