### Instruction: In a batch of 30 apples, 1/6 are too small and 1/3 are not ripe.  The others are perfect. Calculate the number of perfect apples.### Response: In a batch of 30 apples, 1/6 * 30 = 5 are too small.
In a batch of 30 apples, 1/3 * 30 = 10 are not ripe.
In a batch of 30 apples, 5 + 10 = 15 are not perfect.
In a batch of 30 apples, 30 - 15 = 15 are perfect.
The answer is 15