SOLUTION: Sally can fold 15 bed sheets in 4 minutes. Eric can fold 12 bed sheets in 5 minutes. Jane can fold 7 bed sheets in 2 minutes. How long would it take all three to fold 386 bed

Algebra ->  Rate-of-work-word-problems -> SOLUTION: Sally can fold 15 bed sheets in 4 minutes. Eric can fold 12 bed sheets in 5 minutes. Jane can fold 7 bed sheets in 2 minutes. How long would it take all three to fold 386 bed      Log On


   

Question 945969: Sally can fold 15 bed sheets in 4 minutes. Eric can fold 12 bed sheets in 5 minutes. Jane can fold 7 bed sheets in 2 minutes.

How long would it take all three to fold 386 bed sheets?




a. 20 minutes

b. 35 minutes

c. 37 minutes

d. 40 minutes
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
Sally's rate is +15%2F4+ sheets / min
Eric's rate is +12%2F5+ sheets/min
Jane's rate is +7%2F2+ sheets/min
---------------------------------
+15%2F4+=+75%2F20+
+12%2F5+=+48%2F20+
+7%2F2+=+70%2F20+
-------------------
In +20+ min:
Add their rates to get rate for +20+ min
+75%2F20+%2B+48%2F20+%2B+70%2F20+=+193%2F20+
Working together, they can fold +193+ sheets
in +20+ min
Note that +386+=+2%2A193+
It will take them twice as long, or +40+ min
to fold +386+ sheets
The answer is (d)