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After Sally takes 20 shots, she has made $75 \textbackslash\%$ of her shots. After she takes 10 more shots, she drops her percentage to $60 \textbackslash\%$. How many of the last 5 shots did she make? (adapted from 2004 AMC 8, Question\#6) 
Overseas Competition->Knowledge Point->Word Problem Modules->Solving Problems Involving Fractions and Percentages->Percentages Word Problems
Sally made $0.75 * 20=15$ shots originally. Letting $x$ be the number of shots she made, we have $\frac{15+x}{30}=0.6$. Solving for $x$ gives us $x=3$ 