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Kaya      [u] [225]

Cheese  [u]

                 Cheese                        Kaya                     Total

                      u                             u + 225                2u+225

Sold          (1/2)u                  (7/9)(u+225)                 ?

Left           (1/2)u                  (2/9)(u+225)               128

(1/2)u   +  (2/9)(u+225)     =   128    <—  x 18 on both sides

9u + 4u + 900 = 2304

13u = 1404

u = 108

Total buns = 2(108) +225  = 441

Total Buns sold = 441-128 = 313

 

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