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primary 5 | Maths | Rate & Ratio
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Jane lee
Jane Lee

primary 5 chevron_right Maths chevron_right Rate & Ratio chevron_right Singapore

Any teacher can teach me how to do please.

Date Posted: 5 years ago
Views: 429

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Hwee Hong
Hwee Hong's answer
4 answers (A Helpful Person)
I’m not sure if u understand this but this is what my teacher thought me. It’s before change after and units and parts. Hope this helps :)
Jane lee
Jane Lee
5 years ago
Thank you very much teacher. I understood better now
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Nalin Sharma
Nalin Sharma's answer
35 answers (Tutor Details)
1st
Here's your free tuition! :)
Jane lee
Jane Lee
5 years ago
Teacher any easier way to workout the question pls?
Nalin Sharma
Nalin Sharma
5 years ago
Don't quite know if an easier method exists Jane, but the gist of this method is to understand the wording of the question. If the ratio between Mary and Henry is 3:1, that means Mary has 3 times more number of stamps than Henry. So, if Henry has 100 Stamps, Mary has 300. Which leads me to Equation 1 above, 3H = M, which means that 3 times Henry's stamps is equal to Mary's stamps. So in this case 3 × 100 = 300.

In the second part, they sell and buy some stamps. Mary gets 36 more, and Henry sells 20. Simply put, the stamps each of them have now are (M + 36) and (H - 20). Treat these two as separate terms. Now, Mary has got 36 stamps and Henry has lost 20. The ratio is now 5:1, which means Mary has 5 times more stamps. So again, imagine that Henry had 100 stamps and Mary had 500. 5 times Henry's stamps = Mary's stamps. Therefore, 5 × (H - 20) = M + 36. Remember from equation 1 that 'M' can be substituted with 3H and you're pretty much done :)
Jane lee
Jane Lee
5 years ago
TQ for good explanation. I will try to understand it.
TQ for teaching
Nalin Sharma
Nalin Sharma
5 years ago
Okay! Please do let me know if you do not understand.