Question
John had 10% as many pens as Ivan. After John and Ivan bought another 15 pens and 6 pens respectively, John had 50% less pens than Ivan. How many pens did Ivan have at first?
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John had 10% as many pens as Ivan. After John and Ivan bought another 15 pens and 6 pens respectively, John had 50% less pens than Ivan. How many pens did Ivan have at first?