To determine how many marbles Janelle has left after losing some, we need to know the specific number of marbles she lost. Without that information, we cannot provide an exact answer. However, if you know the number of marbles she lost, you can simply subtract that number from the starting total of 15 marbles. For example, if she lost 5 marbles, subtract 5 from 15 to find out how many she has left: 15 - 5 = 10 marbles.
