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Question
primary 6 | Maths
| Ratio
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The answer ia 63 books at first.
Date Posted: 4 years ago
Views: 229
Before:
Book = 7u
File = 8u
After
Book = 7u + 12
File = 8u - 22
Book = 3
File = 2
Therefore;
2(7u +12) = 3(8u - 22)
14u + 24 = 24u -66
10u = 90
1u = 9
At 1st,
Book = 7u
= 7 x 9
= 63.
Book = 7u
File = 8u
After
Book = 7u + 12
File = 8u - 22
Book = 3
File = 2
Therefore;
2(7u +12) = 3(8u - 22)
14u + 24 = 24u -66
10u = 90
1u = 9
At 1st,
Book = 7u
= 7 x 9
= 63.
Do not understand on the subsitution part after therefore.
Why is 2(7u+12) = 3(8u-22)
and not
2(8u-22)=3(7u+12)?
Why is 2(7u+12) = 3(8u-22)
and not
2(8u-22)=3(7u+12)?
Yes. Many student confused on this part.
After
Book = 7u + 12
File = 8u - 22
Book = 3
Mean 7u+12 = 3
File = 2
mean 8u-22 = 2
In order to make book = file
Book = 3 time 2 = 6
File = 2 time 3 = 6
So
7u+12 time 2 = 8u-22 time 3
Can see it...?
If not, I draw model to explain. Let me know if needed.
After
Book = 7u + 12
File = 8u - 22
Book = 3
Mean 7u+12 = 3
File = 2
mean 8u-22 = 2
In order to make book = file
Book = 3 time 2 = 6
File = 2 time 3 = 6
So
7u+12 time 2 = 8u-22 time 3
Can see it...?
If not, I draw model to explain. Let me know if needed.
Ok, i understood. It is clear to me.
See 1 Answer
done
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Hope this helps
Date Posted:
4 years ago
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