Ben Looi's answer to Clarine Peh's Primary 5 Maths Percentage question.
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Draw a model of people remaining.
50% or 1/2 of women = 1/4 men + 80.
So total people before is
Women + men = (2 units of men + 80*2) + 4 units of men
400= 6 units men + 160
1 unit of men= 240/6=40mwn
Solve the rest.
50% or 1/2 of women = 1/4 men + 80.
So total people before is
Women + men = (2 units of men + 80*2) + 4 units of men
400= 6 units men + 160
1 unit of men= 240/6=40mwn
Solve the rest.
Date Posted:
5 years ago
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