Use the multiplier method to increase £72 by 12%
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Ametalworker has a metal alloy that is 30? % copper and another alloy that is 55? % copper. how many kilograms of each alloy should the metalworker combine to create 90 kg of a 50? % copper? alloy?

Given the two similar triangles, how do i find the missing length? if a=4, b=5, and b'=7.5 find a'

Ineed the solution to this problem and the steps.