37, 10, 82 29, 11, 47 96, 15, 87 42, ?, 15

Answer is 6

37, 10, 82 - 3+7 = 10 & 8+2 = 10 29, 11, 47 - 2+9 = 11 & 4+7 = 11 96, 15, 87 - 9+6 = 15 & 8+7 = 15 42, ? , 15 - 4+2 = 6 & 1+5 = 6.

Can you tell us the missing number that fit in the grid?

Find the missing number in the following grid?

In JEECAT exam, a student scores four marks for every correct answer and loses one mark for every wrong answer. If Jagjit attempts all sixty questions and secures 130 marks. Can you tell us the number of questions Jagjit attempted correctly?