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May I get help on this I am struggling with math

May I get help on this I am struggling with math-example-1

1 Answer

2 votes
60/18 = A/3....60 in A to 18 in B = x in A to 3 in B
cross multiply because this is a proportion
(18)(A) = (60)(3)
18A = 180
A = 180/18
A = 10 milligrams <===
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