Answer:
D. 25% decrease
Step-by-step explanation:
Since it's clear that they read less books to find how much it decreased we multiply 100 with 15 then divide it by 20
100 × 15 ÷ 20 = 75 this result shows a 25% decrease.
yes
it will be 95%
hope that helps
20 units²
I have included the answer as well as an explanation and formula above. Note that the formula is only for area of trapeziums/trapezoids