SSC CGL 2011 Question Paper Tier 1 - Shift 1 (June 19th)

Question 103

I multiplied a natural number by 18 and another by 21 and added the products. Which one of the following could be the sum?

Solution

let's say one number is n and another number is p
so acc. to question sum will be 18n+21p
and this number will be divisible by 3 so answer will be (A)

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