Pls help I’m stuck on this question and I can’t figure it out! Will give brainliest!

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 is the value of x? enter your answer in the box. photo attached.

Can someone pls ! pls answer all. no explanation needed..