a yellow bin for recovering recyclable materials , a brown to recover compostable materials and another black for waste. Analysis showed that recovered in

yellow tray random volume in the interval [ B, B + D] liters. This amount is in

the interval [ D, B + D] liters for brown container and is in the interval [ C, C + D] to liters

black tray. It is assumed that the quantities recovered different bins are mutually

independent.

Since the volume of the yellow bin is greater than that of brown , which is the

probability that the quantity in the black bin is greater than the sum of the two

other trays ?

I try to solve this problem but the thing is, all i have in mind is continued random variable. I dont know where to start. My randomb variable should be the volume i guess ?