Atriangle has interior angles equal to 55, 70 and x. what is the value of x?
a: 180
b: 125
c: 55
d: 10

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?

Me because some of question i don’t understand

The ratio of men to women working for a company is 4 to 5 . if there are 90 women working for the company, what is the total number of employees?