Clive opens a box full of different colored balls.  The box contains 6 blue balls, 4 red balls, 3 times as many green balls as blue ones and twice as many yellow ones as red ones.  How many balls are in the box Clive opens? Think carefully first, then make a decision:
There are 3 times as many green balls as blue balls so green balls = blue balls * 3. Green balls = 6 blue balls * 3 = 18 green balls. There are 2 times as many yellow balls as red ones so yellow balls = red balls * 2. Yellow balls = 4 red balls * 2 = 8 yellow balls. The total number of all the balls is 6 blue + 4 red + 18 green + 8 yellow: 6 + 4 + 18 + 8 = 36 balls. So, the answer is 36.