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#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.

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#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

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#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?

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