If 4a = 5b and 7b = 9c, then a : b : c is equal to
45 : 36 : 28
44 : 33 : 28
28 : 36 : 45
36 : 28 : 45
Correct Option: A
Given that 4a = 5b ∴ a/b = 5/4 Also 7b = 9c ∴ b/c = 9/7 ∴ a : b = 5 : 4 = (5 x 9) : (4 x 9) = 45 : 36 and b : c = 9 : 7 = (9 x 4) : (7 x 4) = 36 : 28 ∴ a : b : c = 45 : 36 : 28
