sstrike's answer to Lyn's Primary 6 Maths Singapore question.
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13-5 = 8
5:8 = 20:32
32÷(7-3) = 8
3×8-20 = 4 (Ans)
5:8 = 20:32
32÷(7-3) = 8
3×8-20 = 4 (Ans)
Date Posted:
3 years ago
Why 13-5? What are we finding?
How did 5:8 come about?
How did 5:8 come about?
Difference unchanged
In the end
R:B:B-R. = 5 : 13 : 8
【8 ← 13-8】
At first
R:B:B-R = 3 : 7 : 4 = 6 : 14 : 8
【4 ← 7-3 ⇒ 2×4=8 // before and after the difference is a constant】
6-5=14-13=1
5:1=20:4
Ans: 4
In the end
R:B:B-R. = 5 : 13 : 8
【8 ← 13-8】
At first
R:B:B-R = 3 : 7 : 4 = 6 : 14 : 8
【4 ← 7-3 ⇒ 2×4=8 // before and after the difference is a constant】
6-5=14-13=1
5:1=20:4
Ans: 4
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