SimaQ wrote:

What is the volume of a certain rectangular solid?

(1) Two adjacent faces of the solid have areas 15 and 24, respectively.

(2) Each of two opposite faces of the solid has area 40.

Let me try

we need to find the volume of the rectangular solid = W x H x L

St1: gives WxH=15, WxL=24

deviding both statement together --> H/L = 15/24

Still Insuff.

St2: gives: WxH=40, HxL=40, WxL=40

Still can't find WxHxL --> Insuff

Combining both:

H=L(15/24) from St1

HxL=40 from St2

We can find out that L=8

Now we can find both W and H, finally we cn find WxHxL

answer is

D, am i right?