To convert a mixed number to an improper fraction, multiply the denominator by the whole number, add that total to the numerator and put the whole thing over the original denominator.
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Before you can do that, you need to write each mixed number as an improper fraction, and then write both fractions with a common denominator. The only other choice is to write both mixed numbers as decimals, and then add them.
You multiply the denominator by the whole number the add the numerator and you keep the denominator the same.
Change them to improper fractions and double them.
120 is an integer. Integers aren't fractions or mixed numbers. You can write 120 as 120/1 or 119 and 4/4, but it wouldn't be in simplest form. The simplest form of any integer is the integer itself.
The majority of fractions will not be able to become whole numbers. Certain improper fractions, where the numerator is a multiple of the denominator, can become whole numbers. No proper fractions can.