A percent of a whole gives the size of one group within a larger group. The cue is “percent of these”: “these” points back to the full group, so enter the percent followed by “of” and that group’s size in Desmos. Check which group the question asks for; the group left over has a different count.
Hints
- Hint 1
The whole is the group counted as , not the smaller group you’re trying to find. Which count includes every book on the display?
- Hint 2
The part is the group named by the percent. To find its count, type the given percent, followed by “of” and the whole, in Desmos. What count does it return?
Step-by-step
Find the percent of the whole
Step 1Identify the whole and the part
The display holds books, so the whole, the group counted as , is . Nonfiction books are the part to find, so put the whole after “of”: .
- Step 2
Calculate the nonfiction count
Type in Desmos. It displays , so there are 36 nonfiction books on the display. The books left over are a different group. Choice C.