Yesterday evening, emily's journey home took 25% longer than usual, as she was stuck in a traffic jam. by what percentage was her average speed reduced compared to normal

  20%

Step-by-step explanation:

Time and speed are inversely proportional, so if Emily's time was 5/4 of normal, her speed was 4/5 of normal, or 1/5 = 20% below normal.

the answer would be 150 books

step-by-step explanation:

if you divide 300 by 2 you will get 150