A foundry has been commissioned to make souvenir coins. The coins are to be made from an alloy that is 35% sil?

A foundry has been commissioned to make souvenir coins. The coins are to be made from an alloy that is 35% silver. The foundry has on hand two alloys, one with 60% silver content and one with a 10% silver content. How many kilograms of each alloy should be used to make 23 kilograms of the 35% silver alloy?