คำแนะนำของผู้เขียน
questions taken from
https://www.uxbridgecollege.ac.uk/documents/courses/enma/65-gsce-maths-…
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Money in real life problems
questions taken from
https://www.uxbridgecollege.ac.uk/documents/courses/enma/65-gsce-maths-…
