Activity 5: Is This Real? Directions: Analyze and solve each problem below. Follow the steps in solving problem.
1. If a car travels between two cities in 3 hours at an average speed of 60 miles per hour,
how long would it take at an average speed of 90 miles per hour?
2. The number of kilograms of water in a human body varies directly as the mass of the
body. A 96-kg person contains 64 kg of water. How many kilograms of water are in a
60-kg person?
3. The number of girls varied directly as the number of boys and inversely as the number
of teachers. When there were 50 girls, there were 20 teachers and 10 boys. How many
boys were there when there were 10 girls and 100 teachers?
4. Strawberries varied jointly as plums and tomatoes. If 500 strawberries went with 4
plums and 25 tomatoes, how many plums would go with 40 strawberries and 2
tomatoes?
5. The time required to do a job varies inversely as the number of people working. It takes
5hr for 7 carpenters to build a retaining wall. How long will it take 10 carpenters to
complete the job?​