Which is the simplest form of 64:48?

(a) 1:2

(b) 54:48

(c) 3:4

(d) 4:3

64 can be divided by: 1, 2, 4, 8, 16, 32, 64

48 can be divided by: 1, 2, 3, 4, 8, 12, 16, 24, 48

So, their largest common factor is 16. Then,

64:48 = (64 ÷ 16) : (48 ÷ 16) = 4:3