Question 615637
A certain drug is made from only two ingredients: compound A and compound B. There are 5 milliliters of compound A used for every 4 milliliters of compound B. If a chemist uses 255 milliliters of compound A, how many milliliters of the drug will be made? 


{{{A/B = A/B}}}


{{{5/4 = 255/B}}}


5B = 255 * 4


Amount of compound B that will be used = {{{(255(4))/5}}}, or {{{(51cross(255)(4))/1cross(5)}}}, or 51 * 4, or 204


Total amount of the drug that will be made = amount of compound A + amount of compound B, or 255 + 204, or {{{highlight_green(459)}}} mL


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