ralia A.

asked • 08/16/17

Ecuardo is writing math problems

Please help!!!, I know this may seem easy, but I really need help please help and show the steps- to how you got there it would be very helpful, Thank you!
 
Ecuardo is writing math problems.He writes 1 problem on day 1, 2 problems on day 2, 3 problems on day 3, and so on. If this pattern continues , on what day does he write the 50th problem?

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Andrew M. answered • 08/16/17

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1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 = 55
 
In 9 days he wrote 45 problems.
He wrote the 50th problem on the 10th day...
 
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David W.

Gauss' famous formula for the sum of the number from 1 to n is:   n*(n+1)/2
   Sum of numbers from 1 to 9 is 9*10/2=45
   Sum of numbers from 1 to 10 is 10*11/2 = 55
 
So, when would Ecuardo write problem number 1000 ?
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08/16/17

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