Consider kite WXYZ. What are the values of a and b?

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

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 missing step in this proof ?