sstrike's answer to J.Y.'s Primary 5 Maths Percentage Singapore question.
May I ask why do you know that 210 is the 75% of the boys in group B In the end and that 90 is the 25% of boys in group a in the end? thanks
Pair method // total unchanged concept
Did you notice the table there
1 pair
1u + 1p = 1200÷4=300
3u + 1p = 2×240=480
2u=480-300=180
1u = 180÷2=90
1p = 300-90=210
Did you notice the table there
1 pair
1u + 1p = 1200÷4=300
3u + 1p = 2×240=480
2u=480-300=180
1u = 180÷2=90
1p = 300-90=210
It is similar as the question u posted earlier
https://ask.manytutors.com/questions/118613
⇨
pair concept
https://ask.manytutors.com/questions/118613
⇨
pair concept
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