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primary 6 | Maths | Ratio
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Xeno
Xeno

primary 6 chevron_right Maths chevron_right Ratio chevron_right Singapore

Step by step answering, thanks.

The answer ia 63 books at first.

Date Posted: 3 months ago
Views: 37
AC Lim
AC Lim
3 months ago
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.
Xeno
Xeno
3 months ago
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)?
AC Lim
AC Lim
3 months ago
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.
Xeno
Xeno
3 months ago
Ok, i understood. It is clear to me.

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AC Lim
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