Answer:
6 weeks
Step-by-step explanation:
Set up a proportion where x is the amount of time with 12 pupils:
= 
Cross multiply and solve for x:
4x = 24
x = 6
So, it will take 12 pupils 6 weeks to complete the job.
Another number will be negative.
I minimized the answers down to 1 and 4, the other two are not correct
Answer:
0.66
Step-by-step explanation:
1.00 - 0.34 = 0.66
The probability of certainty is 100%=1
If Probability(p)=0.34
then
0.34+Probability=1
Probability(!p)=1−0.34=0.66