In a minibus, a maximum of 15 students can sit, and three times that number can sit in a big bus. 112 students want to go for a trip such that each student occupies exactly one seat. What is the minimum total number of vehicles required?

Some friends decided to go on a picnic and the amount fixed for expenditure was ₹ 768. Due to the non-arrival of four friends, each participating friend had to bear an additional amount of ₹ 16. How many friends participated in the picnic?

From a certain number of apples, a man sells half the number of apples plus 1 to the first customer, sells 13 of the remaining apples plus 1 to the second customer, and 15 of the remaining apples plus 1 to the third customer. He then finds that he has 3 apples left. How many apples did he have initially?