ATAR Notes: Forum

Archived Discussion => 2009 => End-of-year exams => Exam Discussion => Victoria => Further Mathematics => Topic started by: dcaridi on November 04, 2009, 07:07:00 pm

Title: iffy questions exam 2
Post by: dcaridi on November 04, 2009, 07:07:00 pm: hey guys i was wondering if u could help my by telling me what answers u got on the question about the right cone fuel tank in trig?
Title: Re: iffy questions exam 2
Post by: Ilovemathsmeth on November 04, 2009, 07:10:46 pm: I got 93.6%. The number of decimal places was unspecified. I worked it out like this:

Height ratio = 50 : 20 = 5:2
Volume ratio = 125: 8
Removed part = 125 - 8 = 117
% of oil removed = 117/125 x 100/1
Title: Re: iffy questions exam 2
Post by: halobro on November 04, 2009, 07:24:36 pm: Quote from: Ilovemathsmeth on November 04, 2009, 07:10:46 pm
I got 93.6%. The number of decimal places was unspecified. I worked it out like this:

Height ratio = 50 : 20 = 5:2
Volume ratio = 125: 8
Removed part = 125 - 8 = 117
% of oil removed = 117/125 x 100/1

Who, I did it the hard way. I created my own radii being 10 and consequently 4 given the scaling. Then found both volumes. Then divided it and what not which gave me my answer of 93.6%
Title: Re: iffy questions exam 2
Post by: techhatesme on November 04, 2009, 07:28:56 pm: [quote author=halobro link=topic=19179.msg193261#msg193261 date=1257323076

Who, I did it the hard way. I created my own radii being 10 and consequently 4 given the scaling. Then found both volumes. Then divided it and what not which gave me my answer of 93.6%
[/quote]

Damn it, sounds so logical now. Not enough prep.
Title: Re: iffy questions exam 2
Post by: nikinoo on November 04, 2009, 07:33:46 pm: oh gees.. my ways seems stupid but

i went
2/5 = 0.4
0.4^3 = 0.064
0.064 x 100 = 6.4
100-6.4 (because fraction removed)
= 93.6

wow.. weird. my looks silly.. haha
Title: Re: iffy questions exam 2
Post by: Fireworks on November 04, 2009, 07:40:05 pm: Quote from: nikinoo on November 04, 2009, 07:33:46 pm
oh gees.. my ways seems stupid but

i went
2/5 = 0.4
0.4^3 = 0.064
0.064 x 100 = 6.4
100-6.4 (because fraction removed)
= 93.6

wow.. weird. my looks silly.. haha

I did it this way :)
Title: Re: iffy questions exam 2
Post by: pbesson on November 04, 2009, 08:07:26 pm: will 94% be accepted?
Title: Re: iffy questions exam 2
Post by: lucyk on November 04, 2009, 08:32:32 pm: wait, if it start off at a height of 5 and ended with 2, doesn't that mean 3 was removed?? crapppp
Title: Re: iffy questions exam 2
Post by: halobro on November 04, 2009, 09:33:29 pm: Quote from: techhatesme on November 04, 2009, 07:28:56 pm
[quote author=halobro link=topic=19179.msg193261#msg193261 date=1257323076

Whoa, I did it the hard way. I created my own radii being 10 and consequently 4 given the scaling. Then found both volumes. Then divided it and what not which gave me my answer of 93.6%

Damn it, sounds so logical now. Not enough prep.
[/quote]

Why thank you :)
Getting complemented by you is like Shane Warne telling me I'm a pro spin bowler. Or not.... But in all honesty, I just used it as a long way round tool that works, because I knew that if I attempted it your way would most likely mess up a ratio or what not.

Good luck tomorrow with accounting!
Title: Re: iffy questions exam 2
Post by: Hooligan on November 04, 2009, 09:45:57 pm: Quote from: Ilovemathsmeth on November 04, 2009, 07:10:46 pm
I got 93.6%. The number of decimal places was unspecified. I worked it out like this:

Height ratio = 50 : 20 = 5:2
Volume ratio = 125: 8
Removed part = 125 - 8 = 117
% of oil removed = 117/125 x 100/1

you did the exact same way I did it!! :D