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Answer

  Quantity Price Quantity x Price
Mugs u 4.9 4.9u
Plates u + 12 2.9 2.9(u + 12)

Since she paid 12.80 more for the plates

2.9(u + 12) -> 4.9u + 12.8

2u -> 22

1u -> 11

a) No of mugs bought -> 11

b) Cost of all the plates -> 2.9 (11+12) = 66.70

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