15 ants can move 600 sugar cubes of 10 grams each to their home in 5 hours. Then how many sugar cubes of 5 grams each, will 20 ants move in 3 hours?	Choose the correct answer
A) 360
B) 480
C) 720
D) 960
E) 1000
D   15 ants move   600/5= 
<gadget id="calculator">  600/5</gadget>
<output>120</output>
120 sugar cubes of 10 grams in 1 hour.   5 grams sugar cubes will take less time to move.   Thus if weight of the sugar cube is 5 grams, 15 ants will move 120 X 10 / 5= 240 sugar cubes in 1 hour.   More ants, more sugar cubes they can move.   20 ants will move 240 X 20 / 15 = 320 sugar cubes in 1 hour   Thus in 3 hours, 20 ants will move 320 X 3 = 960 sugar cubes of 5 grams.
<result>D</result>
15 ants can move 600 sugar cubes of 10 grams each to their home in 5 hours. Then how many sugar cubes of 5 grams each, will 20 ants move in 3 hours?