If 5a = 3b=20, then 45ab =
A
1200
B
1050
C
1100
D
1150
Correct Answer: 1200
5a = 20 3b = 20 - - - - - - - - - - - 15ab = 400 3 × 15ab = 45ab = 400 × 3 = 1200. ans.