Mathematics
Mathematics, 27.06.2019 13:30, fefe57

The high school courtesy club bought red and black ink pens for teacher appreciation day. the club bought 75 pens in all. each black pen cost $1.75, and each red pen cost $2.00. the club spent $137 altogether for the pens. how many black pens did the club buy? 13 23 48 52

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