Sin Yee's answer to Celia's Primary 6 Maths Data Analysis Singapore question.
How u get 1 unit =5?
3 units (Sally's age now) - 2 units (Sally' age 5 years ago) = 1 unit OR
5 units (Ming Li's age now) - 4 units (Ming Li's age 5 years ago) = 1 unit
5 units (Ming Li's age now) - 4 units (Ming Li's age 5 years ago) = 1 unit
Tqvm
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