% glycolic acid needed to replace 40% phosphoric acid

[Pastaking]

Homework Statement

What is the % glycolic acid needed to replace 40% phosphoric acid (assuming it is weight%)?

Homework Equations

The Attempt at a Solution

I tried to solve this by first converting the Phosphoric acid weight% to mol/L for the phosphoric acid (5.11 mol/L)..
Since phosphoric acid is triprotic, I just multiply by 3 the calculated Molarity of phosphoric acid for the molarity of glycolic acid ... I am not sure if i did it right...how do we find the answer?

 

[Bystander]

Need some numbers. Your numbers. Not mine.

 

[Pastaking]

That is all the numbers for the question...