« previous next »
Pages: [1]   Go Down

Author Topic: Math Q  (Read 1989 times)

Offline XIII_BD

  • Newbie
  • *
  • Posts: 7
  • Reputation: 25
Math Q
« on: February 12, 2010, 10:49:14 am »
How many gallons of distilled water must be mixed with 50 gallons of 30% alchohol solution, to obtain a 25% solution.

pls help me out here u guys....
Logged

Offline astarmathsandphysics

  • SF Overlord
  • *********
  • Posts: 11271
  • Reputation: 65534
  • Gender: Male
  • Free the exam papers!
Re: Math Q
« Reply #1 on: February 12, 2010, 12:19:07 pm »
There are 15 gallons water to start.Suppose x gallons are added, the amount of solution is 50+x
(15)/(x+50)=0.25
15=0.25x+12.5
0.25x=2.5 so x=10
Logged

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Math Q
« Reply #2 on: February 13, 2010, 08:39:03 am »
omg this looks so easy, but its still hard :P
Logged

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: Math Q
« Reply #3 on: February 13, 2010, 08:56:04 am »
dude, that integration question that u posted, it was soooo damn funny

i cud not stop laughing man

hehe
Logged

Offline SGVaibhav

  • SF Farseer
  • *******
  • Posts: 3013
  • Reputation: 5737
  • Gender: Male
  • Bugatti Veyron 16.4
Re: Math Q
« Reply #4 on: February 13, 2010, 09:16:47 am »
Quote from: The Dude 321 on February 13, 2010, 08:56:04 am
dude, that integration question that u posted, it was soooo damn funny

i cud not stop laughing man

hehe

mee???
lol which one??
Logged

Offline Saladin

  • The Samurai
  • Honorary Member
  • SF V.I.P
  • *****
  • Posts: 6530
  • Reputation: 59719
  • Gender: Male
  • I believe in those who believe in me
    • Student Tech
Re: Math Q
« Reply #5 on: February 13, 2010, 05:16:41 pm »
The integration question like where u cud not get why it was 2 instead of 4, and it was basically cuz u 4got to sq.rt.
Logged

nid404

  • Guest
Re: Math Q
« Reply #6 on: February 16, 2010, 05:33:51 pm »
This is like serial dilutions......we have it in bio

50 gallons of 30% acohol solution
15 gallons of alcohol
v1c1=v2c2
50X30=V2X25
V2=60gallons

So 10 litres of water to be added....
Actually the same thing as astar but mabe this should make it easier
Logged
Pages: [1]   Go Up
« previous next »