Hello there, and thank you for posting your question here on brainly.
So we know that 20/20 is 100% correct, 10/20 is 50% correct, and 15/20 is 75% correct.
We can keep on adding by 1 to figure out what 80% (or 0.80) would be.
In fact, we only need to add it by one a single time.
16/20 = 0.80
0.80 = 80%
Hope this helped!! ☺♥
