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.

x = amount of the first alloy

y = amount of the second alloy

we know the first alloy is 25% copper, so then there is (25/100) * x of copper in it, namely 0.25x.

likewise, we know the second alloy is 75% copper so then there is (75/100) * y of copper or 0.75y.

he needs a 60 kgs mixture that 65% copper, or (65/100) * 60 = 39.

answer: on kudzu, being female and being green are independent events.

step-by-step explanation:

~dasgupta/mathbook/append17dec2k8.pdf