4. $\frac{3}{4}+\frac{2}{3}+\frac{1}{5}=$

Explanation:

Step1: Find common denominator

The common denominator of 4, 3 and 5 is 60.

Step2: Rewrite fractions

$\frac{3}{4}=\frac{3\times15}{4\times15}=\frac{45}{60}$, $\frac{2}{3}=\frac{2\times20}{3\times20}=\frac{40}{60}$, $\frac{1}{5}=\frac{1\times12}{5\times12}=\frac{12}{60}$

Step3: Add fractions

$\frac{45}{60}+\frac{40}{60}+\frac{12}{60}=\frac{45 + 40+12}{60}=\frac{97}{60}$

Answer:

$\frac{97}{60}$