Can someone please help me? <3

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?

What are the constants in this expression? -10.6+9/10+2/5m-2.4n+3m

Could somebody me with this radical simplification?