Find the smallest number that meets all of these conditions * when you divide the number by 5 there are 3 left over

* When you divide the number by 8 there are 2 left over

* When you divide the number by 9 there are 4 left over

There are 3 green marbles in the box.

Step-by-step explanation:

15% = 0.15

To figure out how much 15% of 21 is, you must multipl the decimal form of the percentage by the whole number. This will give you how much of that number that percentage is.

0.15 * 21 = 3.15  

But you can't have 0.15 of a marble, so you must round as well.

3 green marbles in the box.