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Question
primary 5 | Maths
| Whole Numbers
One Answer Below
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Help thxthx
Date Posted: 2 years ago
Views: 493
You can use guess and check.
Assumption is easier method.
Assumed all are answer correctly, total score = 20×5 = 100
Score extra = 100-58 = 42
Incorrect answer , total score deducted
= 2 + 5(which if correct answered)
= 7
Therefore, number of problems answer wrongly,
= 42 ÷ 7
= 6
So, answer correctly = 20-6 = 14.
Assumption is easier method.
Assumed all are answer correctly, total score = 20×5 = 100
Score extra = 100-58 = 42
Incorrect answer , total score deducted
= 2 + 5(which if correct answered)
= 7
Therefore, number of problems answer wrongly,
= 42 ÷ 7
= 6
So, answer correctly = 20-6 = 14.
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Hope this helps
Date Posted:
2 years ago
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