Periactin medication liquid is labeled as 5 mg/5 mL. How many mg would be in 25 mL? Solve for the unknown value. Write as fractions, and then cross-multiply and divide.
Set up the proportion as fractions:
5 mg / 5 mL = x mg / 25 mL
Write as fractions:
5/5 = x/25
Cross-multiply:
5 × 25 = 5 × x
125 = 5x
Divide both sides by 5:
x = 125 / 5 = 25 mg
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