AC Lim's answer to Theetha Ambigai's Secondary 1 Maths Singapore question.

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AC Lim
Ac Lim's answer
13081 answers (A Helpful Person)
1st
X/3 = Y/6
X/Y = 3/6 = 1/2
Therefore, ratio
X : Y = 1 : 2
Theetha Ambigai
Theetha Ambigai
2 years ago
Could you explain, how you bring X/Y=3/6

Thank you.
Eric Nicholas K
Eric Nicholas K
2 years ago
Alternative, but closely related, line of thought

x/3 = y/6
2x/6 = y/6

Then of course the numerators are the same.

2x = y

y is twice of x

So, ratio y : x is 2 : 1
And ratio x : y is 1 : 2
Eric Nicholas K
Eric Nicholas K
2 years ago
Using AC Lim’s approach,

x/3 = y/6

If we perform cross multiplication,
6x = 3y
2x = 1y

If we do cross division (read up on it),
x/y = 1/2

So the ratio x : y = 1 : 2
Theetha Ambigai
Theetha Ambigai
2 years ago
Thank you so much for your explanation. I understood now.
Theetha Ambigai
Theetha Ambigai
2 years ago
Thank you.