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8 April, 09:55

Find two consecutive numbers whose sum is 115

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  1. 8 April, 10:23
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    Let's call the first number x. We know that the second number is consecutive (which means it comes right after the first number), so it's going to be x + 1.

    We know when you work out the sum of these two numbers, it equals 115, so now you can form an expression:

    x + (x + 1) = 115

    Now you just need to simplify and combine the similar terms:

    2x + 1 = 115

    Now subtract 1 from both sides:

    2x = 114

    And finally, divide by 2 on both sides to isolate the x:

    x = 57

    Now that you know x = 57 (where x is the first number), you know that the second number is going to be 1 more than that (as it's consecutive). So it's going to 58.

    Your two numbers are 57 and 58. And when you add them together, you'll get 115 (as 57 + 58 = 115).
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