Primary level maths problem, please help

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Primary level maths problem, please help

Post Number:#1  Unread postby annar » Sat Sep 17, 2016 8:40 am

Hey guys,
I am no maths genius and need help with this itsy bitsy problem. I know I can easily find the solution by adding them one by one but I was wondering if someone can come up with a quicker solution to this problem, some sort of a formula I guess.

This is the problem:

A train will hold 78 passengers. If it starts out empty and picks up one passenger at the first stop, two passengers at the second stop, 3 passengers at the third stop and so on. After how many stops will it be full?

Thanks, appreciate the help
annar
 
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Joined: Sat Sep 17, 2016 8:39 am

Re: Primary level maths problem, please help

Post Number:#2  Unread postby aritra barua » Sun Jan 22, 2017 9:06 pm

Well,this simply reduces the problem to the sum of n consecutive positive integers,which follows the equation :n(n+1)=156,simply factoring the expression,we find n=12 and n cannot be -13 as it is a negative integer.This just solves our problem that at the 12th stop,the bus would be full... :lol:
aritra barua
 
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Joined: Sun Dec 11, 2016 2:01 pm


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