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'Plenty of Pens' printed from http://nrich.maths.org/

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Amy went into her local stationery shop. Her mum had given her £2.50 to spend.

Amy liked the look of some luminous pens, which cost 15p each, and some fancy pencils, which cost 10p each.


She bought four times as many pens as pencils and was given 40p change.

How many of each did she buy?