Answer: 
Step-by-step explanation:
When you add fractions with different denominators, you need to find the Least common denominator (LCD):
Descompose the denominators (5 and 15) into its prime factors and then choose the commons and non-commons with the highest exponents:

Divide the LCD by each original denominator of each fraction and multiply the result by each original numerator of each fraction. After this, you can add the numerators and reduce the fraction.
Then:

.0000079 because you would have to go 6 back since its negative
F(x)= 4x this is because everything is times 4
What is 9f..... either way Hi
16÷10=1.6
4÷1.6=2.5
2.5 oz will balance out the recipe :)
btw this is scale factoring