Forgive me if I'm wrong, math isn't my best subject.
Answer:
600 ml of pure water.
Step-by-step explanation:
To determine how much pure water the pharmacist should add to a 600ml solution with 30% active ingredient, so that this solution becomes 15%, the following calculation must be performed:
600 x 0.3 = 180
15 = 180
100 = X
100 x 180/15 = X
18,000 / 15 = X
1,200 = X
1,200 - 600 = 600
Thus, 600 ml of pure water should be added to achieve a 15% solution.
B- No; because the product of two irrationals can also be rational
So for this all you have to do is put 500 over 1200 like this: 500/1200 and then divide 500 by 1200 to get a decimal which would be .416 .To get the percentage you have to multiply by 100 and get 41.6%. They want the nearest integer so the answer would be about 42% :)
The remainder of 166 is:
4.
You put the remainder over the divisor and simplify.
Easy!
27 4/6
or
27 2/3
