Bird feed worth $.50 per lb is mixed with bird feed worth $.75 per lb to produce 200 lb of a mixture worth $.55 per lb. How many pounds of each type of bird feed is used?

(40 points) i need some . an answer definition is appreciated as well.

Ihonestly have no clue if it's each or none.

Two cities a and b are 1400km apart and lie on the same n-s line. the latitude of city a is 23 degrees. what is the latitude of city b. the radius of the earth is approximately 6400km.