Intelligent Math Puzzle – Challenge 83

If you REALLY enjoy solving complicated math puzzle and exercise your brain, then this math challenge is just for you! 

Intelligent Math Puzzle – Challenge 83

Challenge:

(-70) + (-60) + (-50) + (-40) + … + n = ?
If the pattern of the above operation continues, which of the following could be the answer?

A- 90

B- 100

C- 150

D- 170

E- 200

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The correct answer is D.

The first number in the equation is -70 and the next item is 10 more than the previous number. If the pattern continues, the sum of all numbers till number +70 is 0. Why?

The next number is 80 and the number after that is 90.
80 + 90 = 170

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