I believe the answer to 1/7 times 20 would be 2.9 that is rounded to the nearest tenth but if your rounding to the nearest whole number it would be 3
As for 1/9 of 82 it would be 9.1 rounded to the nearest tenth and it would be 9 rounded to the nearest whole number.
Answer:

Step-by-step explanation:

The answer is 2 hours u only subtract 3 hours from 5 hours. at least that what i say im not sure if im correct
I must assume that you meant "6 1/2" and not "61 / 2."
If each cupcase requires 1/3 ounce of flour, then the total whole cupcakes that can be made using the entire 6 1/2 oz. bag is
6 1/2 oz 13 oz 1 cupcake
----------------------- = ---------- * ---------------- = 39 cupcakes (answer)
1/3 oz / cupcake 2 (1/3 oz)
6/8 would be the fraction.
Hope this helped!
:)
The question was a little confusing so if i gave you the wrong answer just rephrase your question and i will help!