4 workers finish a job in 12 days. How many days would 12 workers need, working at the same pace?
Answer and explanation
Correct answer: B. 4
- Step 1: More workers means fewer days: the quantities are inversely proportional.
- Step 2: Total work is 4 x 12 = 48 worker-days, so 48 / 12 = 4 days.
Answer
4.
Practise more Mathematics: Ratios and Statistics.
Free questions with an explanation for every one, and full timed FUVEST (University of São Paulo Entrance Exam) mock tests.
More Mathematics: Ratios and Statistics questions
- On a map with scale 1:100000, two towns are 3 cm apart. What is the real distance?
- On a map with scale 1:50000, two towns are 8 cm apart. What is the real distance?
- 5 notebooks cost $20. How much do 10 notebooks cost at the same price?
- What is the mean of the numbers 8, 5, 6, 6, 10?
- 100 mL of a 10% sugar solution are mixed with 100 mL of a 40% sugar solution. What is the concentration of the mixture?
- Five numbers have a mean of 13. When one of them, 25, is removed, what is the mean of the remaining four?