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Asked: If the 6-digit number 254,6bc is completely divisible by 3, find the possible values of b + c.

Since the 6-digit number 254,6bc is completely divisible by 3, sum of digits = 2+5+4+6+b+c is divisible by 3
17 + b + c is divisible by 3
2 + b + c is divisible by 3

(A) 2: 2+2 = 4 is not divisible by 3
(B) 3; 3+2 = 5 is not divisible by 3
(C) 5; 5+2 = 7 is not divisible by 3
(D) 13; 13 + 2 = 15 is divisible by 3: Correct answer
(E) 17; 17+2 = 19 is not divisible by 3

IMO D
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To be divisible by 3, sum of all digits should be divisible by 3. The current sum is 17+ b+c. Only D fits, since it would push the sum to 30.

D is the answer

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The question stem could have been worded better in this case. ‘Possible values’ could be quite misleading.

We need to find the possible value of b+c from among the given options.

Since the 6-digit number is divisible by 3, the sum of its digits should be divisible by 3.
Sum of digits = 17 + b + c. So, 17 + b + c should be divisible by 3. From this stage onwards, we will have to plug in each option for
b+c and check if 17 + b + c is divisible by 3.

Only when b+c = 13 will 17 + b + c yield 30 which is divisible by 3.

The correct answer option is D.

Hope that helps!
Aravind B T
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Solution:

For a number to be completely divisible by 3,the digit sum has to be divisible by 3.

In the question here the digit sum of 254,6bc is 2 + 5 + 4 + 6 + b + c = 17 + b + c

=>17 + b + c has to be a multiple of 3.

Now try the options .

-In A, given b + c =2 => Digit sum of the number = 17 + b + c = 17 +2 = 19 ->Not divisible by 3->Eliminate

-In B, given b + c = 3 = > Digit sum of the number = 17 + b + c = 17 + 3 = 20 ->Not divisible by 3->Eliminate

-In C, given b + c =5 => Digit sum of the number = 17 + b + c = 17 + 5 = 22 ->Not divisible by 3->Eliminate

-In D, given b + c =13 => Digit sum of the number = 17 + b + c = 17 + 13 = 30 ->Divisible by 3-> (option d)

Happy Studying ! :student_woman:

Devmitra Sen
GMAT SME
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