snell's answer to dh's Primary 6 Maths Ratio Singapore question.
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AC : CD = 3 : 1
CD: 7u
AC: 21u
AB : BC = 5 : 2
AB: 5u
BC: 2u
AC = AB+BC = 7u
AD = AC + CD = 28u
AB/AD = 5u/28u = 5/28
AB : AD = 5 : 28
...
CD: 7u
AC: 21u
AB : BC = 5 : 2
AB: 5u
BC: 2u
AC = AB+BC = 7u
AD = AC + CD = 28u
AB/AD = 5u/28u = 5/28
AB : AD = 5 : 28
...
Date Posted:
4 years ago
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