Ametalworker has a metal alloy that is 25% copper and another alloy that is 75% copper. how many kilograms of each alloy should the metal worker combine to create 60kg of 65% copper alloy?
the metal worker should use kilograms of the metal alloy that is 25% copper and kilograms of the metal alloy that is 75% copper.

What is the next step in the given proof? choose the most logical approach. a. statement: m 1 + m 2 + 2(m 3) = 180° reason: angle addition b. statement: m 1 + m 3 = m 2 + m 3 reason: transitive property of equality c. statement: m 1 = m 2 reason: subtraction property of equality d. statement: m 1 + m 2 = m 2 + m 3 reason: substitution property of equality e. statement: 2(m 1) = m 2 + m 3 reason: substitution property of equality