See Jolene's answer to Cindy's Primary 6 Maths Ratio Singapore question

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Cindy

5 years ago

Is the left side folded 2x? Should 19+21 x2, as open up also mirror image like 32

180-19-21-19-21-21-32=

Thank you.

Jolene

5 years ago

Yes, so it will be 180-32(2) - 21 -2(19+21)

Cindy

5 years ago

Thank you