Algebra practice question

Answer: 4

d + g = 10 and 2d + 4g = 28. Doubling the first and subtracting: 2g = 8, so g = 4.

Common wrong answers

If you answered 6

6 is the number of ducks.

If you answered 7

7 divides 28 by 4, ignoring the ducks.

If you answered 14

14 halves 28.

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