It is but isn't "B" suff.....we know areas of all the faces and can calculate the volume. Wording of B seems to be lil off. What u make out of "B" ?
I think MA is right Baner.
Guess you're thinking that "all" the surfaces ("each" opposite pair of surfaces) have an area 40 - which makes the rectangular solid collapse to a cuboid.
I just tried solving the prob:
if length = l, breadth = b and height = h,
(A) lxb = 15, lxh= 24.
Two equations, three variables. Unsolvable.
(B) Two opposite surfaces have area 40 each.
Thus, either, lxb = 40, or hxb = 40 or lxh = 40.
One equation, three variables. Unsolvable.
Combining A and B,
Therefore, 3 equations, three variables. Solvable.
Who says elephants can't dance?