Can someone me solve this problem 1.8 divided by 12

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?

X2 + y 2 = 36 x + y = 6 solve the system of equations.

What three-dimensional solid have 6 rectangular faces, 2 equal bases that are not rectangles and 18 edges