Jax has 15 apples. He sells 7 of them. How many apples are left with him?
(1) Krishna buys ‘8a’ bananas and sells ‘3a’ bananas out of them. How many bananas are left with him?
(2) Joseph has Rs 30x with him. In that if he spend Rs 7x for books and Rs 5x for sweets, how much money is left with him?