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805+ (Hard)|   Remainders|      
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nislam
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How many integers between 150 and 300 inclusive have a remainder of 4 Updated on: 06 Nov 2021, 02:54
Originally posted by nislam on 06 Nov 2021, 01:24.
Last edited by Bunuel on 06 Nov 2021, 02:54, edited 1 time in total.
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D
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!

Difficulty:

95% (hard)

Question Stats:

42% (02:44) correct 58% (03:03) wrong based on 133 sessions

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How many integers between 150 and 300 inclusive have a remainder of 4 when divided by 6 and a remainder of 2 when divided by 8?

A) 3

B) 4

C) 6

D) 7

E) 12
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D
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How many integers between 150 and 300 inclusive have a remainder of 4 06 Nov 2021, 01:47
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nislam
How many integers between 150 and 300 inclusive have a remainder of 4 when divided by 6 and a remainder of 2 when divided by 8?

A) 3

B) 4

C) 6

D) 7

E) 12
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1st such number is 154. If we add any multiple of 24 (Lcb of 8 and 6), the number formed will follow the restriction. There will be 7 such numbers( 154+ 24*6 = 298)

Option D

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nislam
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How many integers between 150 and 300 inclusive have a remainder of 4 30 Jul 2022, 17:57
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could anyone please give the detail solution of the problem?
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How many integers between 150 and 300 inclusive have a remainder of 4 30 Jul 2022, 19:33
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nislam
could anyone please give the detail solution of the problem?
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Sure!

So, we have integers from 150 to 300 all inclusive
Given that it should leave a remainder of 4 when divided by 6 and a remainder of 2 when divided by 8

Let us examine both seperately

Remainder of 4 with 6: So, we know that \(150\) is completely divisible by \(6\) so leaves no remainder so we can say that \(154\) leaves a remainder of \(4\) with \(6\)

Now since 154 leaves a remainder of 4 when divided by 6, so if we keep adding 6 it will keep giving us integers which leave a remainder of 4 when divided by 6

\(154, 160, 166, 172, 178, 184, 190, 196, 202...\) and so on

Remainder of 2 with 8: So, we know that 160 is completely divisible by 8 so leaves no remainder so we can say that 152 is also divisible by 8 which means that
Moderator Note: 154
leaves a remainder of \(2\) with \(8\)

Now since 154 leaves a remainder of 2 when divided by 8, so if we keep adding 8 it will keep giving us integers which leave a remainder of 2 when divided by 8

\(154, 162, 170, 178, 186, 194, 202...\) and so on

So if you observe both lists you see that \(154, 178, 202\) are common in the incomplete list and one thing you notice is that the difference between these subsequent terms is always \(24\)

So we can say that after 154, if we keep adding 24 we will get all the terms who leave a remainder of 4 with 6 and a remainder of 2 with 8
And since there are 151 terms in total, adding 24 six times to 154 will give us the list

\(154, 178, 202, 226, 250, 274, 298\)

\(7\) numbers

Answer - D

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How many integers between 150 and 300 inclusive have a remainder of 4 23 Oct 2024, 12:01
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