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Primary 4 | Maths
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Lau
Lau

Primary 4 chevron_right Maths chevron_right Singapore

Need help for questions 2 and 3. Thanks

Date Posted: 4 years ago
Views: 270
snell
Snell
4 years ago
2.
at first
A: 1u + 280
B: 1u

after
A: 1u + 260
B: 1u + 20


1u + 260 = 3 . (1u + 20)
1u = 100

at first, 380 in A

* * *
snell
Snell
4 years ago
3.
at first
C: 1u
K: 1u + 265

after
C: 1u - 199
K: 1u + 265-50 = 1u + 215

1u + 215 = 4 . (1u - 199)
1u = 337

in the end, total 690

.
.
.
Lau
Lau
4 years ago
Thank you so much

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Christmas MT
Christmas Mt's answer
2903 answers (A Helpful Person)
1st
Use before and after model. Start with after. then add 20 to A ... key is the initial difference between A and B (280)..
Lau
Lau
4 years ago
Thank you