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a) 164 / 7 = 23 R 3
She can buy 23 boxes of chocolate cookies.

b) Common multiple of 6 and 9 is 18.
Cost of 18 pieces of chocolate cookies = 3 x 7 = $21
Cost of 18 pieces of cranberry cookies = 2 x 5 = $10
372 / (21+10) = 12
12 x 18 = 216
She bought 216 cranberry cookies.

216/9 = 24
She bought 24 boxes of cranberry cookies.

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