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primary 6 | Maths
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Alesha
Alesha

primary 6 chevron_right Maths chevron_right Singapore

help me asap :((

Date Posted: 3 years ago
Views: 239
sstrike
Sstrike
3 years ago
(3) meat pie unchanged

aft → A:M = 5u : 6u
b4 → A:M = 5u+18 : 6u

total = M+A → 6u+5u+18 = 84
u = 6

5u+18 = 48 (Ans)
sstrike
Sstrike
3 years ago
(4)
Forwards

LCM (4 , 6) → 12

ate
A → ⅙ = ²⁄₁₂
S → ¼ = ³⁄₁₂

total (at first) → A:S = 12u+42 : 12u

left → A:S = 10u+35 : 9u

A-S = 10u+35 - 9u = u+35 = 45

u = 10

12u+42 = 162 (Ans)



Backwards

LCM (3 , 5) → 15

left
A → 1 - ⅙ = ⅚ = ¹⁵⁄₁₈
S → 1 - ¼ = ¾ = ¹⁵⁄₂₀

total (after) → A:S = 15u+45 : 15u

total (at first) → A:S = 18u+54 : 20u

A-S = 18u+54 - 20u = 54 - 2u = 42

u = 6

18u+54 = 162 (Ans)

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sstrike
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Alesha
Alesha
3 years ago
how can 5u+18 become 48?
sstrike
Sstrike
3 years ago
u=6

5u= 5×6=30

5u+18=?
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Kumaraguru Sanmugam
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