Question

Solve: (2 0 x 3 0 +3 0 x 4 0 ) x 3 0

Answer 1

30×(20+40)×30
900×60
54000

Answer 2

We know that,
(AB + BD ) can be written as
B ( A + D )

Likewise,
(20 x 30 +30 x 40 ) x 30 can be written as
30 ( 20 + 40 ) × 30
i.e, 
30 × 60 × 30
= ( 30 )² × 60
= 900 × 60
= 54000  //

-Kimmus