The 2nd one is right
112.5 divided by 15 is 7.5
28 men are needed to paint the room in 3 hours
<h3><u>Solution:</u></h3>
Given that it takes 12 hours for 7 men to paint a room
We are asked to find number of men required to paint the room in 3 hours
Recognize, "paint the room" is 1 task. One job.
7 men -------- 12 hours ------ 1 job
(7/7) = 1 men ------- 12 x 7 (84) ------- same 1 job
The one men is rate is 84 hours to do the job
We can express this as 1/84 jobs per hour, the one-person rate
Now lets find how many men needed to paint the room in 3 hours
Let the required number of men for 3 hours be "a"
The rates of each person is simply additive.
corresponds to rate x hours = jobs and "a" is a variable for how many men
Thus 28 men are needed to paint the room in 3 hours
Dance Class and Soccer
if the fractions are part of an hour those two fractions hare more than .5 or half an hour reading and swimming would end up being 1/3 of an hour or 20 minutes.
Answer:
1.330×10¹³
Step-by-step explanation:
d=m/v
m=dv
m=(3.12×10⁻²)(4.266×10¹⁴)
m=1.330×10¹³