Mixed problems

L.I to problem solve.
This week for maths we had some problems to solve.
The first task was compulsory, (Meaning it had to be done). For that task, if one person doesn't finish it, they, and everyone else automatically fails. we had to solve Addition, Subtraction, Multiplication, Division, Proportion, and Ratio problems. Addition and Subtraction were the easiest, Multiplication and Division were kind of easy and proportion and ratios were the hardest