3. A 100-milliliter bottle of salad dressing initially consists of 80% oil and 20% vinegar. 40% ofthe dressing is used, and then 4 milliliters of vinegar are added to the bottle. Whatpercentage of the mixture is now vinegar?

Answer:26.67[tex]\%[/tex] of Vinegar contains  in the mixture.Step-by-step explanation:Given:Toatl Mixture in Bottle of Salad dressing= 100 ml80[tex]\%[/tex] Oil in Mixture = [tex]\frac{80}{100}\times100=80 ml[/tex]20 [tex]\%[/tex] Vinegar in Mixture =[tex]\frac{20}{100}\times100=20ml\\[/tex]Now 40[tex]\%[/tex] is Used of total mixture so 60[tex]\%[/tex] is remaining.Remaining mixture = 60% = [tex]\frac{60}{100}\times 100=60 ml[/tex]20% of Vinegar in remaining mixture = [tex]\frac{20}{100}\times 60= 12ml[/tex]4ml of vinegar is added in remaining mixture.Now vinegar quantity in remaining mixture = 12 +4 = 16mlPercentage of Vinegar contains  in the remaining mixture= [tex]\frac{16}{60}\times 100[/tex]= 26.67%