An alloy of tin with copper weighing 12kg contains 45% copper. How much pure tin must be added to obtain an alloy containing 40% copper.

hi there!

question 1 answer: p/q can be terminating when q = 5^m * 2^n

question 2 answer: -1 and -1

question 3 answer: -4

question 4 answer: 5/12

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step-by-step explanation:

add 8+12 to get a simplified answer of 12r-20