Answer: 12 incorrect answers
STEP 1:
Find the total number of questions on the test.
We know that all percents are out of 100, so 84 is out of 100.
Now, set up the proportion.
84 63
100 x
Note: x is the total number of questions on the test.
STEP 2:
Cross multiply -
(63 * 100) = (x * 84)
6300 = 84x
Then, divide both sides by 84.
6300 / 84 = 84x / 84
6300 / 84 = 75
Note: 75 is the total number of questions on the test.
STEP 3:
Subtract the number answered correctly (63)
From total number of questions on the test (75)
To get the number answered incorrectly -
75 - 63 = 12
Note: 12 is the number answered incorrectly.
