Question 20
When asked to find $\frac45+\frac56+\frac79+\frac9{11}$, each of four children makes a mistake. Peter interchanges the numerator and denominator in $\frac45$, Quentin does that to $\frac56$, Rachel does that to $\frac79$ and Sarah does that to $\frac9{11}$. Whose answer is closest to the correct answer?