sstrike's answer to Nathaniel's Primary 6 Maths Ratio Singapore question.
Why multiply 3 and not other numbers?
To work with the whole number
start with the blue marbles as 100% original?
then 40% is 2/5 so balance is 3/5.
so the ratio after ratio for blue which is 1 is multiplied by 3.
start with the blue marbles as 100% original?
then 40% is 2/5 so balance is 3/5.
so the ratio after ratio for blue which is 1 is multiplied by 3.
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