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# Sounds easy - But how to do it in 2 minutes?

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Sounds easy - But how to do it in 2 minutes? [#permalink]

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14 Feb 2007, 06:23
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A certain farmer pays $30 per acre per month to rent farmland. How much does the farmer pay per month to rent a rectangular plot of farmland that is 360 feet by 605 feet? (3560 Sqaure feet = 1 acre) A$5330
B $3360 C$1350
D $360 E$150
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Senior Manager
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14 Feb 2007, 07:04
first of all... an acre is equivalent to 43560 ft^2 and not 3560...

not knowing that in the first place (i come from a country that uses metric...)

i tried to compute this:
360*605*30/3560

do note that 3600/3560 is just slightly more than 1.
so you actually look at a number just a bit higher than 605*3 which is just slightly higher than 1800

there is no such answer choice - so i guessed there is something wrong in the question.... looking on the internet i found the error....
now i try to compute the correct thing:

360*605*30/43560

this can be roughly estimated as: 400*600*30/40000
note that the estimate is likely to be greater than the actual result.
which is - 72*100000/40*1000 = 72/40*100
which is less then 200. so the result must be even less than that.
hence the only possible answer is 150

the lesson here is that you usually don't need to compute things in order to get the answer.... just roughly estimate them - especially if the answer choices are so different from each other.
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14 Feb 2007, 08:43
Quote:
do note that 3600/3560 is just slightly more than 1.
so you actually look at a number just a bit higher than 605*3 which is just slightly higher than 1800

Did the same and wondered 'no choice matches...where am I going wrong?' Didn't expect a typo, but noticed hobbit's reply.

Yes, one good thing about GMAT

Quote:
the lesson here is that you usually don't need to compute things in order to get the answer.... just roughly estimate them
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14 Feb 2007, 16:56
Sumithra wrote:
Quote:
do note that 3600/3560 is just slightly more than 1.
so you actually look at a number just a bit higher than 605*3 which is just slightly higher than 1800

Did the same and wondered 'no choice matches...where am I going wrong?' Didn't expect a typo, but noticed hobbit's reply.

Yes, one good thing about GMAT

Quote:
the lesson here is that you usually don't need to compute things in order to get the answer.... just roughly estimate them

Welcome back
Senior Manager
Joined: 24 Oct 2006
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15 Feb 2007, 07:49
Thank you. I'm just peeping and will continue to do so. I like this place.
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17 Feb 2007, 14:45
hobbit wrote:
the lesson here is that you usually don't need to compute things in order to get the answer.... just roughly estimate them - especially if the answer choices are so different from each other.

I piked these numbers:

360*605 ~ 350*600 = 300*600 + 50*600 = 180,000+30,000=210,000
43,560 ~ 40,000

200,000/40,000 = 5

30*5 = 150

All other answers are way to far from E
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