Let's first solve 2/3 and 4/5.
2/3 = 2/3
4/5 = 4/5
2 * 4 = 8
3 * 5 = 15
= 8/15
Now, let's multiply 8/15 and 3/4 . . .
8/15 = 8/15
3/4 = 3/4
8 * 3 = 24
15 * 4 = 60
= 24/60
Simplifying 24/60 . . .
2/3 x 4/5 x 3/4 = 2/5
2/5 is your final answer.
I hope this helps! :)