And i need with these problem.
an alloy of tin is 15% tin and weighs 20 pounds. a second alloy is 10% tin. how much (to the nearest tenth lb.) of the second alloy must be added to the first alloy to get a 12% mixture.

pounds

() at a farm, animals are fed bales of hay and buckets of gain.each bale of hay is in the shape of a rectangular prism.the base side lengths 2 feet and 3 feet,and the height is 5 feet. each bucket of grain is a cylinder with diameter of 3 feet. the height of the bucket is 5 feet as the height of bale. a. which is larger in area, the rectangular base of the bale or the circular base of the bucket? explain how you know b. which is larger in volume, the bale or the bucket? explain how you know

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie

Solve: 3x+y=6 4x-2y=18 show all work !