Question 2
Answer all ten questions and show detailed solutions. Printed time 60 minutes; each question 4 points. Subcriterion allocations are editorial.
Sarah and her younger brother Stephen earn pocket-money by mowing lawns for neighbors. Sarah uses the lawn mower and wants to earn 5 dollars per hour for herself. Stephen removes cuttings and tidies up. They agree Stephen receives 20% of the total payment. It takes them four hours to mow a nearby large garden. How much must the owner pay for Sarah to earn exactly 5 dollars per hour?
Sarah and her younger brother Stephen earn pocket-money by mowing lawns for neighbors. Sarah uses the lawn mower and wants to earn 5 dollars per hour for herself. Stephen removes cuttings and tidies up. They agree Stephen receives 20% of the total payment. It takes them four hours to mow a nearby large garden. How much must the owner pay for Sarah to earn exactly 5 dollars per hour?