In 7 years, Hyder will be twice as old as he was 8 years ago. How old is he now?
- 23
- 12
- 21
- None of these
Explanation
8 years ago, Hyder's age was x - 8.
7 years from now, Hyder's age will be x + 7.
According to the problem:
x + 7 = 2(x - 8)
Simplify the equation:
x + 7 = 2x - 16
Add 16 to both sides:
x + 23 = 2x
Subtract x from both sides:
23 = x
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