Answer:
1/6
Step-by-step explanation:
given that a formula for a cough syrup contains 1 gr of codeine per fluid ounce.
We have conversion formula teaspoon to oz as
1 teaspoon = 0.1666667 oz
Using this we can say grains contained in one teaspoonful are
1 oz = 1 grain
0.1666667 oz = 0.1666667 oz
Apprxoimately
[tex]\frac{15}{90} \\=\frac{1}{6}[/tex]
