A rectangular block 6 cm by 12 cm by 15 cm is cut up into an exact number of equal cubes. Find the least possible number of cubes.  Choose the most appropriate option
A) 30
B) 40
C) 10
D) 20
E) 50
Explanation:   Volume of the block = (6 x 12 x 15) cm3 = 1080 cm3   Side of the largest cube = H.C.F. of 6 cm, 12 cm, 15 cm   = 3 cm.   Volume of this cube = (3 x 3 x 3) cm3 = 27 cm3   Number of cubes = (1080/27)= 
<gadget id="calculator">(1080/27)</gadget>
<output>40</output>
40.   Answer: 40
<result>B</result>
A rectangular block 6 cm by 12 cm by 15 cm is cut up into an exact number of equal cubes. Find the least possible number of cubes.