Question

(3+6+9+.....+300):150

Answer 1

(3+6+9+...+300):150=150*101:150=101


3+6+9+...+300=3(1+2+3+...+100)=3*(100*101)/2=300*101/2=150*101

Answer 2

3x(1+2+3+...+100):150
3x 101x100/2
(3x 101x50)
303x50/150
=101