Question

50 POINTS!!!!

Answer 1

It will take them 12 minutes because 30-20=10 however you add the time of annoyance on therefore making it 12 minutes

Answer 2

Answer:

C) 12 minutes

Step-by-step explanation:

Given : Leanne can clean a fish tank in 30 minutes

            Karl can clean a fish tank in 20 minutes

To find :

If they work together, how many minutes does it take them to clean a fish tank.

Solution :

Leanne can clean  fish tank in 30 minutes = 1 fish tank

Leanne can clean fish tank in 1 minute = 1/30 part of fish tank

Karl  can clean  fish tank in 20 minutes = 1 fish tank

Karl  can clean  fish tank in 1 minute = 1/20 part of fish tank

If they work together, they can clean fish tank in 1 minute

=  $\frac{1}{30} +\frac{1}{20}$

= $\frac{5}{60}$

Thus,  If they work together, they can clean fish tank in 1 minute = 5/60 part of  fish tank

 If they work together, they can clean 5/60 part of fish tank = 1 minute

 If they work together, they can clean 1 fish tank

= $\frac{1}{\frac{5}{60}}$

=  $\frac{60}{5}$

= 12 minutes

Thus , If they work together it will take 12 minutes to clean a fish tank .