Which are the multiples of 6 that are greater than 20 and less than 50?

The correct option is D 24, 30, 36, 42 and 48
The first 10 multiples of 6 are shown in the figure below.


But, 24, 30, 36, 42 and 48 are greater than 20 and less than 50.

$\therefore$The multiples of 6 which are greater than 20 and less than 50 are 24, 30, 36, 42 and 48.