Answer :
You already know he got 68 right. To find out how much he got wrong. 80-68=12
Now, you now he has 12 wrong. Divide 12/80=0.15
To turn it into a percentage move the decimal two places to the right so,
15% was wrong
You already know he got 68 right. To find out how much he got wrong. 80-68=12
Now, you now he has 12 wrong. Divide 12/80=0.15
To turn it into a percentage move the decimal two places to the right so,
15% was wrong