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Question

Answer

siglapmath
alfretztay
4 pens + 3 files ——- 54
12 pens + 9 files ——- 162
3 pens + 4 files ——- 54 – 3 = 51
12 pens + 16 files ——- 204
16 files – 9 files = 7 files ——- 204 – 162 = 42
1 file ——- 42/7 = 6
Ans : $6.