Answer
7.80
Work Step by Step
$\frac{27.5+136.2}{0.48+20.5}=\frac{163.7}{20.98}=7.8\underset\uparrow02669208$
To round to 3 significant digits, count 3 digits from the left. We are rounding to the hundredths position. The next digit to the right is less than 5, so drop that digit and all other digits to the right.
