Mathematics, 25.03.2020 02:05 Eylul30

A student bought twice as many 10 − cent pens as 15 − cent pens. He also bought as many 20 − cent pens as both of the other two combined. How many of each kind did he get if he paid a total of 190 cents.

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A student bought twice as many 10 − cent pens as 15 − cent pens. He also bought as many 20 − cent pe...