Math Is Fun Forum
Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °
You are not logged in.
- Topics: Active | Unanswered
Pages: 1
#1 2007-09-19 17:36:27
- shivusuja
- Member
- Registered: 2006-09-14
- Posts: 56
linear Inequalities
Please help me out with this problem
A solution of 8% boric acid is to be dilutied by adding a 2% boric acid solution to it. The resulting mixture is to be more than 4% but less than 6% boric acid.If we have 640 liters of the 8% solution, how many litres of the 2% solution will have to be added ?
Thank you.
Offline
#2 2007-09-19 19:23:38
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: linear Inequalities
I'm not sure this is right, but I'll put what I got here anyway, see if it makes good sense.
Let 'a' denote the amount added
We have
We can split this up into 2 inequalities
and
So we have
Offline
#3 2007-09-20 00:20:05
- Identity
- Member
- Registered: 2007-04-18
- Posts: 934
Re: linear Inequalities
Can anyone confirm if it's right?
Offline
Pages: 1