A certain drug is made from only two ingredients: compound A and compound B. There are 4 millimeters of compound A used for every 7 millimeters of compound B. If a chemist uses 546 millimeters of compound B, how many millimeters of the drug will be made?

Respuesta :

858 i believe... 
546/7
78 x 4 (compound a)
312 + original compound b (546)

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