The incubation period of polio virus is _________.
Both1-2 weeks and 7-14 days
12-26 days
1-2 weeks
7-14 days
Last week, it rained on 5 days out of 7 days. The probability that if we pick a random day from the week, it will be a rainy day is
The amount of work done by a monkey in 16 days is equal to the work done by a gorilla in 12 days and by a baboon in 24 days. When working 3 days per week, 27 gorillas can complete a task in 4 weeks. In how many weeks can 12 gorillas, 12 monkeys and 12 baboons together finish the same task, when working 4 days per week?