A mixed number is an addition of its whole and fractional parts.

Add and .

To write as a fraction with a common denominator, multiply by .

Combine and .

Combine the numerators over the common denominator.

Simplify the numerator.

Multiply by .

Add and .

Factor out of .

Cancel the common factor.

Rewrite the expression.

Multiply by .

Multiply 3 1/2*20