AMO 2020 – Primary 5 (Grade 5) Question 16

At a diner, lunches have one fixed price and dinners another. Four lunches and three dinners cost 58 dollars. The next line in the source reads “and lunches and 4 dinners cost 75 dollars”, with the number of lunches missing.

For the intended version consistent with the answer key, use five lunches and four dinners costing 75 dollars. Find the price of one lunch in dollars.