General

[quote=UsoppStyle]first, this is not a math problem, its chemistry problem. and second, what kind of teacher teach you with drugs as example?[/quote]

The process of solving the questions asked is entirely math-based. You don't need to know anything about chemistry to solve it, except maybe a general definition of what a "solution" is. And even that is intuitive in this problem.

[quote=ayonxbing]stop doing drugs[/quote]
drugs are bad, m'kay?

[quote=tk098]a) 120 g
b) about 667 g

You can see that the ratio of solution to drug is 6.666667 : 1. So, to find the amount of drug in the 800 mL solution, you just take the 800 and divide it by 6.6666667.

For part b, you we know that for every 1 g of drug we have 6.666667 mL of solution, so 100 g of drug, will have 666.66667 mL of solution (rounds up to 667 g).[/quote]

You could just do 75/500 and get 0.15 * 800. Seems easier that way IMO

algebra 1 seems fun xD

first, this is not a math problem, its chemistry problem. and second, what kind of teacher teach you with drugs as example?

stop doing drugs

5. a) 500 ml of a solution contains 75 grams of drug x. How much drug x will be found in 800 ml of a solution?
b) How much solution will there be if 100 grams of drug x are used?

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a) Set up two fractions and make them equal each other. You can either choose to put ml on the tops or on the bottoms. Doesn't matter as long as you do the same for both fractions. This is a method that compares two ratios of two different amounts and units...

500/75 = 800/x

Cross multiplying gives youuuuu

500x = 60000
[b]x = 120g[/b]

b) Use the same method. Let me (or anyone, really) know if you don't know what cross-multiplication is.

120g. Cross multiply and solve.
667 g. Do the same for the second.

a) 120 g
b) about 667 g

You can see that the ratio of solution to drug is 6.666667 : 1. So, to find the amount of drug in the 800 mL solution, you just take the 800 and divide it by 6.6666667.

For part b, you we know that for every 1 g of drug we have 6.666667 mL of solution, so 100 g of drug, will have 666.66667 mL of solution (rounds up to 667 g).

It is 120g, just cross x

not enough info is giving for #2 explain again

a) 120 grams (i think)
b) Idk