During a month, Morgan ran r miles at 5 miles per hour and biked b miles at 10 miles per hour. She ran and biked a total of 200 miles that month, and she biked for twice as many hours as she ran. What is the total number of miles that Morgan biked during the month?

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?