Step-by-step explanation:
Given that Cooper answered 28 questions correctly and 7 incorrect answers, If the total number of questions is x,
- let total number of questions be X,
therefore X = 28+7
= 35
- ratio of right answered questions to the total questions, R is
R =
[tex] \frac{28}{35} [/tex]
=
[tex] \frac{4}{5} [/tex]
therefore, the ratio is 4:5
