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One number is (9) more than the other and their sum is (51). What is the larger number?

Answer and explanation

Correct answer: (30)

The direct answer is option C: the larger number is 30. Let the larger number be x and the smaller be y. “Nine more” gives x-y=9, and their sum gives x+y=51. Add the equations: 2x=60, so x=30. Then y=21, and 30-21=9 while 30+21=51. Option C satisfies both facts. Option A, 28, would make the smaller number 19, giving a difference of 9 but a sum of 47. Option B, 29, would pair with 20, giving sum 49. Option D, 31, would pair with 22, giving sum 53. The key is to assign the larger number to x, so subtraction produces a positive 9. Adding the equations is the quickest elimination method because the y terms cancel.

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Linear EquationsWord ProblemNumbersClass 10

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