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primary 5 | Maths | Rate & Ratio
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primary 5 Maths Rate & Ratio Singapore

Is my answer correct? Thanks

Date Posted: 2 years ago

Comments 3 add a comment

Tham Tian Ching Janice

2 years ago

Yes

Sstrike

2 years ago

【total unchanged - internal transfer】

in the end
N:S:N-S = 5:1:4

4u = $2496+2×$408 = $3312
1u = $3312÷4 = $828
$828+$408 = $1236 (Ans)

Check
at first
S → $1236
N→ $1236+$2496 = $3732

in the end
S → $1236-$408 = $828
N→ $3732+$408 = $4140

$4140 ÷ $828 = 5 ✓✓✓

if Ans: $1134
at first
S → $1134
N→ $1134+$2496 = $3630

in the end
S → $1134-$408 = $726
N→ $3630+$408 = $4038

$4038 ÷ $726 ≠ 5

Sstrike

2 years ago

Alternative

u = (6u-$2496)÷2-$408

u = $828

u+$408 = $1236