wikiHow Cross Multiplication Answers 1. x = 10 2. x = 15 3. x = 24 4. x = 21 5. x = 20 6. x = 63 7. x = 24 8. x = 18 9. x = 24 10. x = 36 11. The average speed is 50 miles per hour. 12. It would take 18 days for 20 workers to complete the same project. 13. It would take 4.8 hours (or 4 hours and 48 minutes) for A and B to complete the job together. 14. 1 and 2/3 cups of flour is needed to make 30 cookies. 15. It would take 11.43 days (or approximately 11 days and 10 hours) for them to complete the project together. 16. The average speed is 60 miles per hour. 17. The assistant can complete the project alone in 60 days. 18. It would take 8 hours to fill the tank. 19. 30 workers are needed to complete the same project in 6 days. 20. The car can travel 150 miles on 6 gallons of gas. Page