Hobbiez Neutral Newbie September 21, 2007 Share September 21, 2007 (edited) Just a brain teaser Qn for you: 2 pipes takes 5 minutes to fill up a tank, and the smaller pipe alone takes 6 minutes more than the bigger pipe to fill the tank. How long would it takes for the bigger pipe to fill the tank alone? I will provide the answer shortly. Edited September 21, 2007 by Hobbiez ↡ Advertisement Link to post Share on other sites More sharing options...
Rastaman01 2nd Gear September 21, 2007 Share September 21, 2007 0 min cause the tank is filled already Link to post Share on other sites More sharing options...
Epr0mlse 2nd Gear September 21, 2007 Share September 21, 2007 5.5 mins? Link to post Share on other sites More sharing options...
Freestylers09 5th Gear September 21, 2007 Share September 21, 2007 2 mins? Link to post Share on other sites More sharing options...
Flight_skoda Neutral Newbie September 21, 2007 Share September 21, 2007 Hmmm... my guess is 2 mins as well. Link to post Share on other sites More sharing options...
Baka Neutral Newbie September 21, 2007 Share September 21, 2007 I too lazy to work out the exact mathematical calculation, but my 6th sense tells me it's close to 7min ?? ((5min x 2)-(6min/2)) Link to post Share on other sites More sharing options...
Mivec9 1st Gear September 21, 2007 Share September 21, 2007 5( x/(y+6) + x/(y)) = x 5y + 5y + 30 = y^2 + 6y y^2 - 4y - 30 = 0 y = (4 + 11.66)/ 2 = 7.83 Link to post Share on other sites More sharing options...
Flight_skoda Neutral Newbie September 21, 2007 Share September 21, 2007 Wha ... so technical, see until I Link to post Share on other sites More sharing options...
Baka Neutral Newbie September 21, 2007 Share September 21, 2007 Can anyone tells me this is a question for which level? I need to be mentally prepared for the day that my son's maths will outshine mine... Link to post Share on other sites More sharing options...
Mivec9 1st Gear September 21, 2007 Share September 21, 2007 guess is interest....it looks difficult but if u understand it...it shd be ok Link to post Share on other sites More sharing options...
Moodyzzz Neutral Newbie September 21, 2007 Share September 21, 2007 the bigger pipe will take 6mins lesser than the smaller pipe to fill the tank. Link to post Share on other sites More sharing options...
Mivec9 1st Gear September 21, 2007 Share September 21, 2007 looks like elementary maths to me Link to post Share on other sites More sharing options...
Baka Neutral Newbie September 21, 2007 Share September 21, 2007 elementary math means E maths in A level or PSLE maths? I think someone who dunno this would still be able to get through degree in accountancy in my times.. Link to post Share on other sites More sharing options...
Mivec9 1st Gear September 21, 2007 Share September 21, 2007 E maths...but i'm not sure is it A level standard. A-Maths will be different category. Link to post Share on other sites More sharing options...
Baka Neutral Newbie September 21, 2007 Share September 21, 2007 I remembered my maths knowledge peaked at A levels when I have to know calculus and some other crazy maths stuff, which was later rather useless in Uni days and even more useless now in working life. Now my higher maths rusty liao due to little usage. Just use a financial calculator or Excel and things get computed immediately. But I know these maths problem will haunt me again when my son eventually have to go through the horrible maths questions. Link to post Share on other sites More sharing options...
Kaka23 3rd Gear September 21, 2007 Share September 21, 2007 (edited) 6min? Edited September 21, 2007 by Kaka23 Link to post Share on other sites More sharing options...
Slowmo Clutched September 21, 2007 Share September 21, 2007 3 mins (I'm feeling lucky) Link to post Share on other sites More sharing options...
Icekitten Clutched September 21, 2007 Share September 21, 2007 8 minutes. ↡ Advertisement Link to post Share on other sites More sharing options...
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