1."He had 23 on sale, just three varieties," said Doug. "I didn't take all but I got all three sorts. £500 the lot." Glen gasped. "Wow! But I suppose it costs plenty to bring fancy fish in from Venus. How many of each did you buy?" "Work it out," replied Doug. "A pletzy was two-thirds the price of a gryva. I got twice as many imlacs as gryvas, and at £6 each less than a pletzy." All prices exact pounds. Well?

1 pletzy at £24, 7 gryvas at £31, 16 imlacs at £22

1 pletzy at £19, 4 gryvas at £44, 13 imlacs at £12

1 pletzy at £26, 6 gryvas at £39, 12 imlacs at £20