Answer: 12 hours
Step-by-step explanation:
Given : Working together, it takes Sam, Jenna, and Francisco two hours to paint one room.
When Sam works alone, he can paint one room in 6 hours. When Jenna works alone, she can paint one room in 4 hours.
Let 't' be the time taken by Francisco to paint one room on his own.
Then , we have
Rate of work of Sam +Rate of work of Jenna + Rate of work of Francisco =Rate of work they all do together

i.e. 
i.e. 
i.e. 
i.e. 
i.e. 
i.e. 
i.e. t= 12
Hence, Francisco would take 12 hours to paint one room on his own.
Answer:
4 days in total
Step-by-step explanation:
Answer:
40%
Step-by-step explanation:
1+.40=1.4
1.4 x 15 = 21
Answer:
8.5
Step-by-step explanation:
divide 34 by 4 and it gives you 8.5
Answer:
<h2>210</h2>
Step-by-step explanation:
list of prime #s between 12 and 42:
13, 17, 19, 23, 29, 31, 37, 41
now add them up:
13+17+<em>19</em>+<u>23</u>+<em>29+31</em>+<u>37</u>+<em>41</em>
30+60+60+60
90+120
210