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primary 5 | Maths
| Percentage
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Hi, if add another 10% to make it 20%. Is the answer 120?
Date Posted: 2 years ago
Views: 517
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Date Posted:
2 years ago
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No, the answer is not 120.
The question asks "How many red chairs must be added to the concert hall so that the number of red chairs is 20% of the total number of chairs after that?"
You cannot just add 10% to make it 20%. By doing so, you did not take into account the total number of chairs afterwards. Percentage is about the ratio to the total. As you add the red chairs, the total changes so does the percentage.
Easy way to check is, assuming your answer 120 is correct, try to calculate the percentage of red chairs now, does it give you 20%?
R% = (120+120) / (1200+120) * 100% = 18.18%
Hope this helps.
The question asks "How many red chairs must be added to the concert hall so that the number of red chairs is 20% of the total number of chairs after that?"
You cannot just add 10% to make it 20%. By doing so, you did not take into account the total number of chairs afterwards. Percentage is about the ratio to the total. As you add the red chairs, the total changes so does the percentage.
Easy way to check is, assuming your answer 120 is correct, try to calculate the percentage of red chairs now, does it give you 20%?
R% = (120+120) / (1200+120) * 100% = 18.18%
Hope this helps.
Date Posted:
2 years ago
Many thanks for the clue.
Is the answer 150?
120+150=270/1350=20%.
I am still learning Percentage topic. What is the method to reach 150 if it is correct? I simply adding to the right %.
Is the answer 150?
120+150=270/1350=20%.
I am still learning Percentage topic. What is the method to reach 150 if it is correct? I simply adding to the right %.
Any formula method I can use?
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Date Posted:
2 years ago
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Thanksfor the clue.Is the answer 150? I used long method. Any formula method ?
Date Posted:
2 years ago
Sorry I accidently deleted the other answer with comment due to repetitive of my posting. Can share the formula method again?
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Date Posted:
2 years ago
Thank you so much
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Date Posted:
2 years ago
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