If x is a multiple of five, is x+3 a multiple of five?

Ineed i been stuck on this question since yesterday

The width of a rectangle is 20 units. can the perimeter p of the rectangle be 64 units when its length x is 11 units? no, because p = 2x + 2(20) no, because p ≠ 2x + 2(20) yes, because p ≠ 2x + 2(20) yes, because p = 2x + 2(20)

Write 5(6x+4)-2(5x-2) in the form a(bx+c) where a,b and c integers and a> 1