Question 850619
Add the whole parts:  3 + 4 = <font size=4 color="blue">7</font>


Add the fractions: 2/7 + 5/7 = (2+5)/7 = 7/7 = <font size=4 color="purple">1</font>


Now add the whole and fraction results:  <font size=4 color="blue">7</font>+<font size=4 color="purple">1</font> = <font size=4 color="red">8</font>


This means,


3 2/7 + 4 5/7 = <font size=4 color="red">8</font>