There's no need to feel stupid. Like most things, fluency with basic maths tasks comes mostly from practice.
There's also "good exam practice" which assumes questions don't vary much. Try to get hold of previous papers and work through those. That's less learning to answer general questions and more learning to pass a particular exam, but it's a valid tactic. Obviously you probably already know this.
If you're stuck then collar someone for a hand (hell, even ask here).
I am trying to do as many samples as possible, but whenever I get a new book with previous papers, they seem to have strange tasks which I hevn't met before.
Like this for example: How much water has to be added to 10 gallons of 10% brine solution (what the hell is that, i have no idea) to decrease the concentration to 7%?
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There's also "good exam practice" which assumes questions don't vary much. Try to get hold of previous papers and work through those. That's less learning to answer general questions and more learning to pass a particular exam, but it's a valid tactic. Obviously you probably already know this.
If you're stuck then collar someone for a hand (hell, even ask here).
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Like this for example: How much water has to be added to 10 gallons of 10% brine solution (what the hell is that, i have no idea) to decrease the concentration to 7%?
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My attempt:
If you have 10 gallons of 10% solution, you've effectively got 1 gallon of salt.
1 [amount of salt] = (10/100) * 10 [amount of solution]
For a 7% solution from this:
1 [salt] = (7/100) * n
n = 14.286
So you need to add 4.286 gallons of water to the original solution.
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