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You can click here and read the posting A family in Singapore about Sarin’s family.
You can read the posting Sarin learns Symbol, Algebra and Equation in school (Math Concept) to understand the concept of Algebra.
Read also the posting on Sarin learns the concept of Fraction (mathematics concept)to understand the concept of Fraction.
Challenge yourself with the question before look for the given solution‼!
Upper primary school mathematics question UPQ399
Hairu is 1/5 as old as his father now. In 8 years’ time, he will be 1/3 as old as his father. How old is Hairu now?
After 8 years, both Hairu and his father will be 8 years older
Hairu will be 1/3 as old as his father
Since Hairu is 1/5 as old as his father now
A yellow block above is Hairu today’s age (Green block) plus 8 years
From the model
1 unit = 8 year
Hairu is 8 years old now
Using algebra and equation
Set Hairu age now as H
Father’s age now = 5H
Hairu’s age after 8 years = H + 8
Father’s age after 8 years = 5H + 8
Hairu is 1/3 as old as father
Another word, father is 3 times older than Hairu after 8 years
3 (H + 8) = 5H + 8
3H + 24 = 5H + 8
2H = 24 – 8 = 16
H = 8 years
Hairu is 8 years old now.