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a) Let number of lollipops Mr Lee has be x

Number of lollipops Mr Sng has will be x + 3

After giving away 156 lollipops each,

x + 3 – 156 = 2(x – 156)

x  – 153 = 2x – 312

x = 159

Therefore, Mr Lee has 159 lollipops and Mr Sng has 162 lollipops at first

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