There were a total of 70 questions in a school Science test. 10 marks were awarded for each correct answer and 7 marks were deducted for each incorrect answer or incomplete answer. Usha could not complete all the questions in time and left the last 8 questions blank. She scored 224 marks. How many more correct answers than wrong or incomplete answers did she answer?
Correct answers
|
Marks awarded
(x10) |
Wrong or
incomplete answers |
Marks deducted
(x7) |
Difference
|
| 62 |
620 |
8 |
56 |
564 |
| 61 |
610 |
9 |
63 |
547 |
Number of questions completed
= 70 - 8
= 62
Big difference
= 564 - 224
= 340
Small Difference
= 564 - 547
= 17
Number of wrong answers
= 340 ÷ 17
= 20
Number of wrong and incomplete answers
= 20 + 8
= 28
Number of correct answers
= 70 - 28
= 42
Number of more correct answers than wrong or incomplete answers
= 42 - 28
= 14
Answer(s): 14
