There were a total of 60 questions in a school Science test. 8 marks were awarded for each correct answer and 4 marks were deducted for each incorrect answer or incomplete answer. Tammy could not complete all the questions in time and left the last 4 questions blank. She scored 180 marks. How many more correct answers than wrong or incomplete answers did she answer?
Correct answers
|
Marks awarded
(x8) |
Wrong or
incomplete answers |
Marks deducted
(x4) |
Difference
|
| 56 |
448 |
4 |
16 |
432 |
| 55 |
440 |
5 |
20 |
420 |
Number of questions completed
= 60 - 4
= 56
Big difference
= 432 - 180
= 252
Small Difference
= 432 - 420
= 12
Number of wrong answers
= 252 ÷ 12
= 21
Number of wrong and incomplete answers
= 21 + 4
= 25
Number of correct answers
= 60 - 25
= 35
Number of more correct answers than wrong or incomplete answers
= 35 - 25
= 10
Answer(s): 10
