text: Wow, 150% of her pens are red.  You should note that Claire has more red pens than total pens, which makes no sense at all.  If you meant she has 4 red pens out of 6 pens total, then here you go:\n\n(4 red pens)/(6 pens total) = .6666666\n.6666666 x 100% = 66.666% (two thirds of her pens are red)\n\nIf you meant she has 6 red pens and 4 non-red pens, then this is what you want:\n\n(6 red pens)/(10 pens total) = .6\n.6 x 100% = 60% (three fifths of her pens are red)