In a company, it takes 4 employees 4 days to complete a task. it would take 2 employees 8 days to complete the same task.

(1) In one day eight workers do 1/121/12-th of the total work, so each workers does

(2) Four workers thus do

so how many days do they need to finish the work?

The above is the general setting for these problems. In the present case there is, of course, a much simpler approach: 44 workers will finish the work in twice the time as 88 workers...

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%