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Primary 4 | Maths
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Please help me. Am I supposed to do it in fraction form?
Date Posted: 4 years ago
Views: 649
Yes you do not need to do in Fraction form
Susila is 12 years old.
Her father is 35 years old.
That’s a difference of 23 years. This difference will never change even as the years pass by.
Now, in a certain year Susila’s age will be half that of her father’s age.
Their difference remains 23 years.
Let Susila’s new age be 1 unit and her father’s new age be 2 units.
The difference is 2 - 1 = 1 unit, which corresponds to the difference of 23 years.
1 unit = 23 years
So Susila would have been 23 years old and her father would have been 46 years old.
Recall that Susila is now 12 years old and her father is now 35 years old.
The difference in time must have been 23 - 12 (or 46 - 35) = 11 years.
Her father is 35 years old.
That’s a difference of 23 years. This difference will never change even as the years pass by.
Now, in a certain year Susila’s age will be half that of her father’s age.
Their difference remains 23 years.
Let Susila’s new age be 1 unit and her father’s new age be 2 units.
The difference is 2 - 1 = 1 unit, which corresponds to the difference of 23 years.
1 unit = 23 years
So Susila would have been 23 years old and her father would have been 46 years old.
Recall that Susila is now 12 years old and her father is now 35 years old.
The difference in time must have been 23 - 12 (or 46 - 35) = 11 years.
The answer is 11
Rachael, for this type of question, we must recognise that the difference in ages of any two people will always remain unchanged. We use this fact to solve the question.
We then make use of the fact that at some point Susila’s age is half her father’s age, so we introduce the unitary concept here, bearing in mind that the difference in ages between both of them remains the same at 23.
We then make use of the fact that at some point Susila’s age is half her father’s age, so we introduce the unitary concept here, bearing in mind that the difference in ages between both of them remains the same at 23.
Ok Eric. Thank you for your explanation.
Thanks to Mhiru & Eric again. So grateful
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Date Posted:
4 years ago
Sorry..... 23-12=11 right? And why 23-12? May I ask you to explain?
We need to find how many years time. If you don't understand than you can do another senorio which is 23×2-35=11.Sorry l did a careless mistake.
Ok.... I try to understand. Thanks Mhiru
If you have any more problems just inform me
I will try to solve it
I will try to solve it
Thank you, Mhiru
To improve your maths skills you can watch some math questions and how they solve it. You can even pause the video and try the question yourself and after that you can continue the video to see if your answer is correct. If you do not know how to solve it you can learn yourself. By doing this l believe you can do your best you can just squeeze your brain. And let numbers flow like birds
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Hope this helps!
Constant difference method. Make the difference before and after the same.
Constant difference method. Make the difference before and after the same.
Date Posted:
4 years ago
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