The answer to the problem would be 10 19/12 (Improper Fraction) or 11 7/12 (Proper Fraction).
To start, you would want to make both fractions on each whole number have the same denominator by finding the least common multiple, in this case it is 12.
To change the denominator in the fraction 3/4, you would multiple the denominator by 3 to make it 12, and what you do to the bottom you must do to the top ( multiple the numerator by 3 as well ), making it 9/12.
To make the denominator 12 in the fraction 5/6, simply multiple the denominator by 2 to make it 12, and the numerator by 2 as well to make it 10, making it 10/12.
Solve the new equation:
4 9/12 + 6 10/12 =
10 19/12 (Improper Fraction) or 11 7/12 (Proper Fraction).