Answer:
20 minutes
Step-by-step explanation:
Melissa works as fast as two Bettys, so working together, they get the job done at the rate 3 Bettys could do it. That time is (60 minutes)/3 = 20 minutes.
Working together, Betty and Melissa can mow the lawn in 20 minutes.
_____
You can also think in terms of mowing rates as lawns per minute. The total mowing rate is ...
Betty's rate + Melissa's rate = (1/60 lawns/min) +(1/30 lawns/min)
= (1/60 +2/60) lawns/min = 1/20 lawns/min
The inverse rate is then ...
20/1 min/lawn
Together, they take 20 minutes to mow 1 lawn.
0, 2, 8, 10
Cross out 0 and 10
Left with:
2,8
Add them
10
Divide by 2
5 is the median.
When two are left in the middle you find the mean or average of them. Basically add them together and divide by 2.
The answer is B. 60 cubic inches
5 x 6 x 2 = 60
Answer:
<h3>THEY ARE CONGRUENT BY <em><u>ASA</u></em> TEST OF CONGRUENCE</h3>
Area of circle = pi r^2 = 81pi
1/3 of circle = 81pi / 3 = 27 pi units^2
answer
B. 27 pi units^2
