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
Bạn đang xem 3. - TRƯỜNG THCS HOÀNG XUÂN HÃN