End of Module Project in Basic Concepts at c++ program. I'm confused? Can you give me a solution?

Question

Help me to fine out End of Module Project in Basic Concepts at C++. Part Trasportation

Answer 1

You can calculate the number of people in the last bus with modulo operator %. Then to get the free seats subtract that from 50

Answer 2

But first, what should i do ?
the code ?

Answer 3

Declare variable,
read input,
calculate result,
output result

The instructions needed have been taught in the preceding lessons, so repeat them if you don't know how to write it