Question
Some pens and files were packed into black and brown packets. There were 7 more black packets than brown packets. Each black carton contained 9 pens and each brown carton contained 19 files. Given that there were 27 fewer pens than files in total, how much pens were there?
3 m

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Some pens and files were packed into black and brown packets. There were 7 more black packets than brown packets. Each black carton contained 9 pens and each brown carton contained 19 files. Given that there were 27 fewer pens than files in total, how much pens were there?