Four workers paint a wall in 6 days. Working at the same rate, how long do 8 workers need?
Answer and explanation
Correct answer: C. 3 days
- Step 1: Total work = 4 workers x 6 days = 24 worker-days. Step 2. With 8 workers the time is 24 / 8 = 3 days. Answer: 3 days. Why not the others: Time falls as workers rise (inverse proportion); it falls to a half, not to a third or by one day per worker.
Practise more Logical Reasoning.
Free questions with an explanation for every one, and full timed Prueba Unica Nacional (Peru Teacher Appointment Test) mock tests.
More Logical Reasoning questions
- What number comes next in the series 5, 9, 13, 17, ... ?
- What number comes next in the series 2, 6, 18, 54, ... ?
- In the series 1, 1, 2, 3, 5, 8, ... each term follows a rule. Which term comes next?
- What number comes next in the series 1, 4, 9, 16, 25, ... ?
- What letter comes next in the series A, C, F, J, O, ... ?
- Rule: 'If it rains, the school yard is closed.' The yard is open today. Which conclusion is certain?