To simplify a fraction, you must find a number both the numerator and denominator can be divided into, and divide. Say I have 4/6. Both numbers are divisible by 2, so I simplify the fraction to 2/3. As we can no longer divide, the fraction is in simplest form. Hope this helps!
To find unit price you would take the price and divide it by your amount
He should bring 1416 ounces of salad (12onces per person) 12*118=1416ounces