You need a 50% alcohol solution. on ha d, you bave a 350 ml of a 40% alcohol mixture. how much pure alcohol will you need to add to obtain the desired solution?

Plz answer asap! i will reward brainliest and 12 points for these three questions!take notice: these three questions are completely different! 1) what is the percentage of sugar in the syrup made of 10 kg of water and 4 kg of suugar? 2) what was the original price if after 10% discount it became $450? 3) at first a price was decreased by 12%, then it was disounted again by an additional 5%. what is the percent of the total discount? , and remeber i will award brainliest and 12 points!

What number gives you a irrational number when added to 2/5

What is the value of 4x to the third +4x if x is 4