Wynn

Hello, I have this logical question: We have 3 chests A, B, C. We know that chest A have more coins than chest B. Also we know that one the chest contains 50 gold coins and next one contains 40 silver coins and the last one contains 10 gold coins and 10 silver coins. What is lowest number of coins blindly taken from chest which guarantees content determination of each chest? Sorry english is not my native language. Good Luck