Matematika anglicky

Ahoj, neporadil by mi někdo jak sestavit výpočet této anglicky napsané úlohy? Pořád mi vychází 23 ale správný výsledek je 27

Katy is on a diet. Her daily fat intake should not exceed 50 g. Her breakfast consisted of a vegetable salad, to which she added 100 g Edam cheese. Edam cheese has a fat content of 30 % dry matter, and dry matter constitutes 50 % of the entire mass of the cheese. For lunch, Katy had steamed vegetables supplemented with 50 g Feta cheese. Feta cheese has a fat content of 40 % dry matter, and dry matter constitutes 40 % of the entire mass of Feta cheese. Given that all Katy’s fat intake came from the cheese, how many grams of fat can she still eat before she reaches her daily limit?