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The sum of integers should be divisible by 5 from 50 to 85 is

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540

530

650

455

answer is A.

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Detailed Solution

5 multiples 50 to 85 are 50,55,60,65,70,75,80,85

$= 5 10 + 11 + 12 + ....... + 17$

$= 5 Σ 17 − Σ 9$

$= 5 17 × 18 2 − 9 × 10 2 = 540$

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