Mr. Chens students read 40 books. In july, they read 30 books. what is the percentage decrease?

The percent decrease is 25%

Step-by-step explanation:

if you convert the fraction 30/40 into a percent then 30/40 is 75%.

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.