Three baskets A, B and C contain different numbers of differently colored marbles. Basket A contains 4 red marbles and 2 yellow marbles. Basket B contains 6 green marbles and 1 yellow marble. Basket C contains 3 white marbles and 9 yellow marbles. What is the difference between the number of each color of marble in the basket that has the greatest difference?
Let's think step by step below.
6
In basket A the number difference between differently colored marbles is 4 - 2 = 2.

In basket B the difference is 6 - 1 = 5.

In basket C the difference is 9 - 3 = 6.

Comparing 2, 5 and 6 shows that 6 is the greatest difference.

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Thus, the answer is 6