Question

. If a natural number is multiplied by 18 and another by 21 and the products are added. Which oneof the following number could be the sum of the products ?(A) 2002 (B) 2003
(C) 2004 (D) 2005

Answer 1

let the numbers be x and y
then,
18x + 21y will be the sum of their products
this can be written as
3(6x+7y)
hence, the sum of their products should be divisible by 3
in the given options only 2004 is divisible by 3 so that's the answer

Answer 2

Answer:

2003

Explanation:

let the numbers be x and y

then,

18x + 21y will be the sum of their products

this can be written as

3(6x+7y)

hence, the sum of their products should be divisible by 3

in the given options only 2004 is divisible by 3