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If s denotes the sum of the integers from 1 to 30, inclusive

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Director
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If s denotes the sum of the integers from 1 to 30, inclusive [#permalink] New post 15 May 2018, 09:03
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If S denotes the sum of the integers from 1 to 30, inclusive and t denotes the sum of the integers from 31 to 60 inclusive. What is t-s?


[Reveal] Spoiler:
900


src: orbit test prep
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Manager
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Re: If s denotes the sum of the integers from 1 to 30, inclusive [#permalink] New post 15 May 2018, 20:25
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I got the answer right but anyone still have a method? The way I thought this would be is when we subtract s from t, each integer would come down to 30. For example, since it is (1+2+3...+30) - (31+32+33...60), subtract 1 from 31, 2 from 32, 3 from 33.. 30 from 60, etc. Now we are left with 30 30s. So 30x30=900.
Director
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Re: If s denotes the sum of the integers from 1 to 30, inclusive [#permalink] New post 15 May 2018, 21:01
Your approach is fine. This is one method you could apply for the answer.
Re: If s denotes the sum of the integers from 1 to 30, inclusive   [#permalink] 15 May 2018, 21:01
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If s denotes the sum of the integers from 1 to 30, inclusive

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