Yxcas's answer to Ruby's Primary 6 Maths Singapore question.

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Yxcas
Yxcas's answer
184 answers (A Helpful Person)
1st
a)
(50p - 9p - 80 - 12p) / 2
= (29p - 80) / 2
= (29/2)p - 40

b)
50p = 400
p = 8
(29/2)(8) - 40 = 116 - 40 = $76