Dan got 45 out of 72 correct in his test. What fraction of the marks did he get wrong?
Give your answer in its simplest form.

3/8

Step-by-step explanation:

45/72=5/8

(5/8)+x=72/72

x=1-(5/8)

x=3/8

answer: a.   one is a factor of every whole number since every number is divisible by itself.