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## A factory producing tennis balls stores them in either big b

tagged by: ceilidh.erickson

This topic has 2 expert replies and 2 member replies
sachin_yadav Master | Next Rank: 500 Posts
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#### A factory producing tennis balls stores them in either big b

Sat Feb 06, 2016 6:53 am
A factory producing tennis balls stores them in either big boxes, 25 balls per box, or small boxes, with 17 balls per box. If 94 freshly manufactured balls are to be stored, what is the least number of balls that can be left unboxed?

A. 0
B. 1
C. 2
D. 3
E. 4

OA is B

I just want to know if my reasoning is correct or not

Case 1: 25*3 = 75
94 - 75 = 19 balls left
These 19 ball can be put in a small box of 17, so 2 balls are left

Case 2: 17*4 = 68
95 - 68 = 26 balls left
These 26 balls can now be put in a big box of 25, so 1 ball is left

Now the question asks what is the least no. of balls that can be left unboxed. So, it is 1 ball as in case 2.
Please let me know if my reasoning is correct

Thanks & Regards
Sachin

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Last edited by sachin_yadav on Sat Feb 06, 2016 12:19 pm; edited 1 time in total

Marty Murray Legendary Member
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Sat Feb 06, 2016 9:32 am
What you did looks good to me.

I went through and tested the other cases, 0 x 25 and 2 x 25, just to be sure.

Maybe you did too.

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Rich.C@EMPOWERgmat.com Elite Legendary Member
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Sat Feb 06, 2016 9:43 am

Your approach to this question is perfect. This question essentially comes down to brute force - since the numbers involved are rather specific and the total number of balls is relatively small, you really just have to do enough work to test the following options:

No 25-ball boxes
1 25-ball box
2 25-ball boxes
3 25-ball boxes

One of those options will produce the result that the question is asking for.

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ceilidh.erickson GMAT Instructor
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Thu Feb 11, 2016 5:03 pm
Your solution is the best - in fact, the only - solution to employ in a case like this. Whenever you are given a word problem with INTEGER CONSTRAINTS (in this case, we can't have half a ball) and it's asking you about possible combinations, your only option is to test out the numbers.

My recommendation is to use a chart to keep things organized:

The methodology is the same, though.

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sachin_yadav Master | Next Rank: 500 Posts
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Mon Feb 15, 2016 1:12 am
Thank you all. Appreciate your replies.

Regards
Sachin

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