8cleaners can clean an office in 3 hours, if the block needs to be cleaned in 2 hours, how many cleaners will be needed?

12 cleaners

Step-by-step explanation:

8 cleaner can clean in 3 hours = 1 office

1 cleaner can clean in 3 hours =  part of job

1 cleaner can clean in 1 hours =  part of job

Let the number of cleaner required to finish the job in 2 hours = x

hence

x cleaner can clean in 1 hours =  part of job

x cleaner can clean in 2 hours =  part of job

Hence

Hence we need 12 men to complete the same job in 2 hours

c is the correct answer

step-by-step explanation:

the expected value of the random variable : 0, 1 and 2

step-by-step explanation: