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primary 5 | Maths | Whole Numbers
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Rosie
Rosie

primary 5 chevron_right Maths chevron_right Whole Numbers chevron_right Singapore

How to solve this world problem

Date Posted: 5 years ago
Views: 412
Isaac Solomon Wong
Isaac Solomon Wong
5 years ago
Okay hi rosie, i don't have paper with me right now, but i can try to help you.
The age differnce is 5. If their total age is going to be 65, take 65-5=60. Take 60÷2, this gives you the age of the younger sibling. So ravi will be 30 years old and devi will be 35.
As ravi is 30 years old, take 30-11=19. So in 19 years, their total age will be 65.

I hope this helps you :)
Rosie
Rosie
5 years ago
Can u help me understand why u do that cuz I don’t understand
Isaac Solomon Wong
Isaac Solomon Wong
5 years ago
Okay, beacuse age difference doesn't change. If i'm 17 now and you're 11, i'm 6 years older than you. When you're 14, i'll be 20. The age gap is still 6 years years, though 3 years have passed. Our total age will increase by 3x2=6 years. The time passed will by mulitplied by 2 and added to our total age.
Rosie
Rosie
5 years ago
Oh thank you and can u help me with another question?
Isaac Solomon Wong
Isaac Solomon Wong
5 years ago
I'm sorry if it's a little confusing. Just know that the age gap doesn't change.
Isaac Solomon Wong
Isaac Solomon Wong
5 years ago
Sure, what do you need help with ?
Rosie
Rosie
5 years ago
Ok can u help me with another question?
Rosie
Rosie
5 years ago
It’s on my profile

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Cherro
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Isaac Solomon Wong
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Hey, here's a black picture for you, HAHA, i don't have paper with me, but i commented the answer, hope this helps you :)
Rosie
Rosie
5 years ago
Can help with the other question?