There are 73 packs of 20 luxury candy balls in each, and they must be repackaged in elegant bags so that there are 6 in each. "Will there be any left over that we can eat?" Rakel wonders. " I'm hungry."

"Should be able to calculate," thinks Lea. "Although it seems difficult."

"If we use modular arithmetic, it won't be that difficult," says Rakel.

Calculate how many candy balls are left using modular arithmetic.

They had 103 packs of another type of candy. It was divided into bags with 9 in each, and there were 4 candies left over to eat.

Formulate the problem "how many candies were in each package?" as a problem in modular arithmetic.

Solve the problem. Strictly follow the methods of modular arithmetic, even if you could solve the problem more easily in another way.