I believe there are 35 backpacks in all. 2 closets have 6 shelves all together. Then 6*5=35.
When you see a "%" you need to ask " a percent of what"?
Here, it's a percent of the original prize, so the discount is 20% of the original prize, that is 20% of 35.
20% is also 20/100 or 1/5, so we can calculate this like this:

so the discount is 7 dollars.
You’ll have to adjust the plotting a bit to fit your graph that you have, but this is the main idea.
Answer:
2/3
Step-by-step explanation:
1/3 is the same as 3/9 (multiply 3 to both numerator and denominator) 3/9+3/9 is 6/9. 6/9 can be simplified by dividing 3 to both sides to get 2/3.
You got 21 papers on Monday. Because if you add 3 7 times it equals 21.
Hope it is correct!