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DEVIDES IN STRING: WHY ONLY START FROM LEFT SIDE?

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by towerSpider » Mon Feb 23, 2015 1:25 pm
THE Q ASKED ABOUT VALUE OF X. AUTHOR/SOLVER BEGINS FROM LEFT SIDE OF TERM (2/2/2/2/2). WHY NOT START FROM RIGHT SIDE IN WHICH CASE WE WOULD HAVE:

2/2/2/2/2
2/2/2/(2^(1-1))
2/2/2/1
2/2/2
2 -> x = 1[/img]
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by Brent@GMATPrepNow » Mon Feb 23, 2015 2:15 pm
When confronted with division and/or multiplication, the order of operations is from left to right.
For example: 15 ÷ 3 x 5 = 5 x 5 = 25 (not 1)
Likewise: 24 ÷ 4 ÷ 2 = 6 ÷ 2 = 3 (not 12)

The same applies to addition and/or multiplication: left to right
So, for example: 5 - 1 + 3 = 4 + 3 = 7 (not 1)

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Brent
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