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Question

Hi able to write model. Unable to solve. Kindly help

Answer

You are almost there with your diagram!

Redraw the boxes horizontally:

Then 2u = 374 - 146 = 228. So u = 228/2 = 114.
Thus Janice packed 146 - 114 = 32 cookies.

CHECK:
  Janice + Siti    = 32 + 114 = 146
  Janice + Huiling = 32 + 3 x 114 = 374


Btw, you misclassified this question as P4 MALAY, instead of MATH.
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