A GLASS BOX 7 CM BY 12 CM BY 18 CM, CLOSED ON ALL SIX SIDES, IS PAR...

3. A glass box 7 cm by 12 cm by 18 cm, closed on all six sides, is partly filled with coloured water. When

the box is placed on one of its 7 by 12 sides, the water level is 15 cm above the table. When the box is

placed on one of its 7 by 18 sides, the water level above the table, in cm, is:

(A) 9 (B) 10 (C) 12.5 (D) 15 (E) 22.5