 
 <prompt> ```In one batch of 30 apples, 1/6 too small and 1/3 no ripe. The rest dey perfect. Calculate the number of perfect apples.``` <response>: ```We first calculate the proportion of all the other apples: 1/6 + 1/4 + 1/12 = 2/12 + 3/12 + 1/12 =6/12
So, the proportion of perfect apples na 12/12 - 6/12 = 6/12 = 0.5.
Thus the number of perfect apples na 0.5 * 30 = 15

The final answer: 15.``` 