John is 7 year older than his sister, and the sum of their ages are 21 years. Find their ages.
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Let age of John’s sister be x
John’s age will 7 + x
Equation
(7 + x) + x = 21
2x = 21 -7
x = 14 / 2 = 7
Answer
Sister’s age is 7
John’s age is 7 + x which is 14
John’s age will 7 + x
Equation
(7 + x) + x = 21
2x = 21 -7
x = 14 / 2 = 7
Answer
Sister’s age is 7
John’s age is 7 + x which is 14
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