1/5 of the vehicles in the junkyard are black trucks
Here, we want to get the fraction of the vehicles in the junkyard are blac trucks
We can easily select any number to represent the number of vehicles
Let us say 120 vehicles are at the junkyard
3/5 of these are trucks
Thus;

Now, out of this 72, 2/6 are black
We have this as;

So, out of the 120, 24 are black trucks
The fraction that are black trucks are thus;
