Level 2
Mark bought a coat and 2 identical ties. He gave the cashier $500 and received $254.20 change. If the coat cost $198.80, how much was the cost of each tie?
Level 3
The total weight of 5 cartons and 7 crates of apples is 130 kg. Each crate of apples weighs thrice as heavy as a carton of apples. How much does each carton of apples weigh?