A community for students.
Here's the question you clicked on:
 0 viewing
anonymous
 4 years ago
Twin brothers, Billy and Bobby, can mow their grandparent's lawn in 76 minutes. Billy could mow the lawn by himself in 15 minutes less time than it would take Bobby. How long would it take Bobby to mow the lawn by himself?
anonymous
 4 years ago
Twin brothers, Billy and Bobby, can mow their grandparent's lawn in 76 minutes. Billy could mow the lawn by himself in 15 minutes less time than it would take Bobby. How long would it take Bobby to mow the lawn by himself?

This Question is Closed

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.2T(bob) + T(bill) = 76 is what im thinking

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.22bob = 91 bob = 91/2 = 45.5 maybe

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.2that almost feels right; almost ...

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.2the by himself part is not being taken into account

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0amistre 64 ineed ur help

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.2if we had the set up the we know bob and bill alone we could get to time together .... so im gonna have to look backwards at this :)

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.2bob = time (b) alone bill = time (b 15) alone \[\frac{1}{b}+\frac{1}{b15}=\frac{1}{76}\] \[\frac{b15}{b(b15)}+\frac{b}{b(b15)}=\frac{1}{76}\] \[\frac{b15+b}{b(b15)}=\frac{1}{76}\] \[\frac{b(b15)}{b15+b}=76\] \[\frac{b^215b}{2b15}=76\] \[b^215b=76(2b15)\] \[b^215b76(2b15)=0\] \[b^215b152b+1140=0\] \[b^2167b+1140=0\] maybe?

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.2b = about 160 or 8; so id go with 160 minutes as a gut thing if:\[\frac{1}{160}+\frac{1}{16015}=\frac{1}{76}\]then it should be good

amistre64
 4 years ago
Best ResponseYou've already chosen the best response.2http://www.wolframalpha.com/input/?i=1%2F160+%2B+1%2F%2816015%29++1%2F76 yeah, im going with that, or close to it
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.