There are 24 marbles in a jar. Half are blue. There are 6 red marbles. The rest of the marbles are orange. How many orange marbles are there? Think carefully first, then make a decision:
There are 24 / 2 = 12 blue marbles. Blue and red marbles make up 12 + 6 = 18 of the 24 marbles. Thus, there are 24 - 18 = 6 orange marbles. So, the answer is 6.