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Can we do this question by plugging in method?

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Intern
Joined: 30 Aug 2017
Posts: 3
Can we do this question by plugging in method? [#permalink]

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30 Sep 2017, 09:01
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Joined: 30 Jan 2016
Posts: 581
Location: United States (MA)
Re: Can we do this question by plugging in method? [#permalink]

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30 Sep 2017, 09:53
Jehi

https://gmatclub.com/forum/a-certain-fr ... l#p1131589
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Re: Can we do this question by plugging in method? [#permalink]

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30 Sep 2017, 17:55
Hi Jehi,

If you take a quick look at the answers choices, you'll notice that they are relatively small and 'close together', so we can use a bit of 'brute force' to get to the correct answer:

We know that there will be no fewer than 10 total pieces of fruit and no more than 14 total pieces of fruit that will total \$6.30, so I'm going to list out the first several multiples of apple prices and banana prices:

Apples:
\$0.70
\$1.40
\$2.10
\$2.80
\$3.50
\$4.20
\$4.90
\$5.60
Etc.

Bananas:
\$0.50
\$1.00
\$1.50
\$2.00
\$2.50
\$3.00
\$4.00
\$4.50
Etc.

Now we just have to find a pair of numbers (one from each group) that will total \$6.30. It's not too much work to find that \$2.80 and \$3.50 total \$6.30, so the total number of pieces of fruit is 7+4 = 11

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Re: Can we do this question by plugging in method? [#permalink]

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01 Oct 2017, 13:06
Nope, can't plug in answer choices on this one. That's because the answer choices represent a sum of two values, rather than a single value. For instance, if the answer was 12, you'd know that apples + bananas = 12, but you wouldn't have a specific value to plug in for apples or a specific value to plug in for bananas.

In general, plugging in the answer choices works best when the answer choices are individual values - for instance, if they represented just the number of apples or just the number of bananas.
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Re: Can we do this question by plugging in method?   [#permalink] 01 Oct 2017, 13:06
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