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Source: — Problem Solving |
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by dimochka » Fri Jan 17, 2014 10:46 am
The way to solve it is to follow order of operations. I've detailed out each step below.

36 + 9 = 45
6(36 + 9) = 6 * 45 = 270
6(36 + 9)/1 = 270 / 1 = 270
6(36 + 9)/1/4 = 270 / 4 = 67.5
80 - 6(36 + 9)/1/4 = 80 - 67.5 = 12.5
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by [email protected] » Sat Jan 18, 2014 5:27 pm
Hi stephny,

I think that dimochka may have misinterpreted something that you wrote. The "intent" of this calculation would be clearer if you used parenthesis or brackets to separate the numbers. I think that the actual equation is supposed to be this:

80 - 6(36+9) / (1/4)

Then the steps would be:

80 - 6(45) / (.25)

80 - 270 / .25

80 - 270(4) / (.25)4

80 - 1080 / 1

80 - 1080

-1000

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by theCodeToGMAT » Sun Jan 19, 2014 10:37 pm
80-6(36+9)/1/4

80 - 6 * (45) * 4

80 - (45)(24)

80 - 1080

-1000
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by theCodeToGMAT » Sun Jan 19, 2014 10:39 pm
dimochka wrote:The way to solve it is to follow order of operations. I've detailed out each step below.

36 + 9 = 45
6(36 + 9) = 6 * 45 = 270
6(36 + 9)/1 = 270 / 1 = 270
6(36 + 9)/1/4 = 270 / 4 = 67.5
80 - 6(36 + 9)/1/4 = 80 - 67.5 = 12.5
The Red part should have been = (270) * 4 = 1080
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