A chemist has 30% and 40% solutions of acid available. How many liters of each solution should be mixed to obtain 30 liters of 34% acid solution? liters of 30% acid
liters of 40% acid

Angela took a general public aptitude test and scored in the 88th percentile for aptitude in accounting. what percentage of the scores were at or below her score?

To decrease an amount by 16% what single multiplier would you use

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.