Directions: Read and solve. Write your answers in lowest terms.
1. A student solved 9 out of 20 problems correctly. What is the ratio of
the number of correct answers to the number of wrong answers?
2. In a consumer opinion survey, 135 out of 420 people preferred
powdered detergents. Give the ratio of people who chose powdered
detergents to the number of people surveyed. Write the ratio in lowest
terms.​