A metal worker has a metal alloy that is 30% copper and another alloy that is 55% copper. how many kilograms of each alloy should the metal worker combine to create 90 kg of a 45% copper alloy?
22.5 of the first alloy and 67.5 of the second.
https://www.wyzant.com/resources/answers/192387/a_worker_has_metal_alloy_that_is_30_copper_and_another_hour_if_that_is_55_how_many_kilograms_of_each_alloy_should_the_metal_worker_combine_to_create_6kg_of_45
22.5 and 67.5
