When the positive integer r is divided by 9, the remainder is 5. What is the remainder when 3r is divided by 9?
Pick:
A) 0
B) 1
C) 3
D) 4
E) 6
Lets take the number as r   when r is divided by 9 the remainder is 5 hence r can be written as   r=9k +5   Multiplying by 3 will give   3r = 27k + 15   we can also write   3r = 27k + 9 + 6   Now 27k and 9 are divisible by 9 leaving the remainder as 6 hence 6 is the answer.
<result>E</result>
When the positive integer r is divided by 9, the remainder is 5. What is the remainder when 3r is divided by 9?