To make 100g of jam you need 23g of strawberries, 29g of
blackberries and the rest should be sugar.
What is the ratio of blackberries to sugar?
Give your answer in its simplest form.

How to determine whether two known pairs of points are on the same line.

How can constraints be used to model a real-world situation?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )