Make up three practical problems according to 2X-4 = 30

Make up three practical problems according to 2X-4 = 30

① There are two pairs of apples with the same number. After eating 4, there are 30 left. How many apples are there in each pile?
② Xiao Ming has two papers to do, none of which has the same number of questions. Now Xiao Ming has done four questions, and there are 30 questions left. How many questions did each paper have?
③ There are two groups with the same number of people. Four of them left, and there are 30 left. How many people were there in each group?