Packs of pens come in sets of 10. Packs of felt pens contain 6 coloured and 4 black If a school buy enough packs so there are 90 black felt pens, how many coloured pens will be bought ?
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out of 10 felt pens, 6 are coloured
so out of (10×9) felt pens, (6×9) are coloured.
the answer is 54.
abonatlast:
Sorry, we have 90 black felt pens
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