Algebra practice question

Answer: 4

x + y = 7 and x − y = 1; adding gives 2x = 8, so x = 4.

Common wrong answers

If you answered 3

3 is the younger brother.

If you answered 6

6 subtracts 1 from 7 without halving.

If you answered 3.5

3.5 halves 7, ignoring the difference.

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