First Estimate the Answer $6 \frac{3}{4}$ Hours on Monday $4 \frac{1}{2}$ Hours on Tuesday

Short Answer

First estimate the answer. Then solve each application problem.
-Juan worked $6 \frac{3}{4}$ hours on Monday, $4 \frac{1}{2}$ hours on Tuesday, $7 \frac{1}{4}$ hours on Wednesday, and $5 \frac{3}{4}$ hours on Thursday. How many hours did he work altogether?