Ok can you plzz look at this and and what does aoc mean

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

25 ! i need asap! ! ill mark brainliest!