What is the volume of the solid figure?

The solid shape is made up of two rectangular prisms. The first rectangular prism has a height of 10 inches, length of 5 inches, width of 5 inches and with connecting to the second rectangular prism, has a smaller height of 5 inches. The second rectangular prism has a length of 15 inches, height of 5 inches, width of 5 inches. The total length of the solid is 20 inches.

A.
625 in3

B.
750 in3

C.
800 in3

D.
1,250 in3

The first rectangular prism has a volume of 10 x 5 x 5 = 250 cubic inches.

The second rectangular prism has a volume of 15 x 5 x 5 = 375 cubic inches.

The smaller section of the first prism has a volume of 5 x 5 x 5 = 125 cubic inches.

Therefore, the total volume of the solid figure is 250 + 375 + 125 = 750 cubic inches.

So the answer is (B) 750 in3