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Answer

If Mandy bought 15u cookies and 15u Doughnuts,

15u * 15/3 – 15u * 12/5 = 156

75u – 36u = 156

39u = 156 

u = 4

15u = 60 

30u = 120

So She bought in total 120 cookies and doughnuts.

 

Check: 60/3 * 15 = 300

60/5 * 12 = 144

300 – 144 = 156 checked.

 

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