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Math Expert V
Joined: 02 Sep 2009
Posts: 56306
When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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7 00:00

Difficulty:   15% (low)

Question Stats: 77% (01:31) correct 23% (02:23) wrong based on 168 sessions

### HideShow timer Statistics When a positive integer is divided by 4, the remainder is r; when divided by 9, the remainder is R. What is the greatest possible value of r^2+R?

A. 23
B. 21
C. 17
D. 13
E. 11

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e-GMAT Representative V
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Posts: 2943
When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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Bunuel wrote:
When a positive integer is divided by 4, the remainder is r; when divided by 9, the remainder is R. What is the greatest possible value of r^2+R?

A. 23
B. 21
C. 17
D. 13
E. 11

Solution

When a positive integer is divided by 4, the remainder can be 0,1,2 or 3.

Hence we can infer that the value of r can be 0,1,2 or 3
.

Similarly, when a positive integer is divided by 9, the remainder can be 0,1,2,3....8

Hence we can infer that the value of R can be 0,1,2,3,4,5,6,7 or 8.

Since we have to maximize $$r^2 + R$$, we need to consider the maximum value of both r and R, which will be 3 and 8 respectively.

Hence the maximum value of the expression is:

$$r^2 + R$$

$$=3^2 + 8$$
$$=9 + 8$$
$$=17$$

Thanks,
Saquib
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Re: When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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Option C)

Given: r = Remainder[$$\frac{N}{4}$$] & R = Remainder[$$\frac{N}{9}$$]
: Greatest possible value of (r^2 + R) ?

N = K*LCM(4,9) + X
i.e., N = 36 + X or 72 + X or . . .
To find Greatest possible value of (r^2 + R):
we need to maximize r and R.

For a given number M, greatest possible remainder could be (M-1).
Similarly, greatest possible remainder for N could be ( LCM(4,9) - 1) = 35
So, N could take values = 36 + 35 or 72 + 35 or . . .
And, r = 3 & R = 8.

Here, r = 3 (i.e., 4-1 = greatest possible remainder a number can have on dividing by 4) and R = 8 (i.e., 9-1 = greatest possible remainder a number can have on dividing by 9)

Hence, Greatest possible value of ( r^2 + R) = ( 3^2 + 8) = 17
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Re: When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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$$n=4p+r$$
$$n=9q+R$$

the remainder is always smaller then the dividor, so r<4, and R<9.
Since the remainder is always an integer, the greatest possible value for r and R is: r=3, R=8

$$r^2+R=9+8=17$$
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Re: When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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1
Bunuel wrote:
When a positive integer is divided by 4, the remainder is r; when divided by 9, the remainder is R. What is the greatest possible value of r^2+R?

A. 23
B. 21
C. 17
D. 13
E. 11

Using the concept of divisibility, you can get the answer with minimum calculation.

When a number is divided by 4, the maximum value of r can be 3.
When a number is divided by 9, the maximum value of R can be 8.

Now all we need to figure out is whether we can have a number such that when divided by 4, it gives remainder 3 and when divided by 9, it gives remainder 8.

Imagine the number split into groups of 9 and 8 leftover. When the same is divided by 4, the 8 leftover will be evenly split into groups of 4. From each group of 9, we will make 2 groups of 4 each such that 1 is leftover from each group of 9. We want 3 to be leftover when we divide by 4 and this will be possible if we have 3 groups of 9.

So basically such a number could be 3*9 + 8 = 35 etc

Hence, maximum value of r^2 + R = 3^2 + 8 = 17

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Re: When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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Is this a real 600 level question? :O
Veritas Prep GMAT Instructor D
Joined: 16 Oct 2010
Posts: 9449
Location: Pune, India
Re: When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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MvArrow wrote:
Is this a real 600 level question? :O

No. About 680 - 700 level I would say.
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Karishma
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Math Expert V
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Posts: 56306
Re: When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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MvArrow wrote:
Is this a real 600 level question? :O

You can check difficulty level of a question along with the stats on it in the first post. For this question Difficulty: 600-700 Level. The difficulty level of a question is calculated automatically based on the timer stats from the users which attempted the question.
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GMAT 1: 680 Q48 V35 When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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Bunuel wrote:
When a positive integer is divided by 4, the remainder is r; when divided by 9, the remainder is R. What is the greatest possible value of r^2+R?

A. 23
B. 21
C. 17
D. 13
E. 11

Another way that works is to gauge the LCM of the two divisors (4 and 9) and the LCM - 1 will yield that number ($$36-1=35$$) for which both divisions result in the maximum remainder (3 and 8 respectively).

I don´t actually know why this works (probably is based on the theory that some of the other users have already posted) but if you encounter something similar, it´s a ready-to-apply and go.

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Re: When a positive integer is divided by 4, the remainder is r; when divi  [#permalink]

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_________________ Re: When a positive integer is divided by 4, the remainder is r; when divi   [#permalink] 08 Apr 2019, 01:34
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