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Neuron
If you would like to know how many items are left in the case, you can calculate this using the following steps:

24 items - 11 items = 24 - 11 = 13 items are left

The correct result would be 13 items.
Leader
There are 24 items in a case.
11 items are removed.

To find out how many items are left, we need to do subtraction.

24 - 11 = 13

13 items are left in the case.