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18 nickels and 10 pennies
1/18
1/3 of 450 is equal to 450/3 which is 150
18 entities had 72 legs so the average number of legs was 72/18 = 4. Since none of those present had more than 4 legs, the average could be four only if none had fewer than four legs. It follows that there were 0 women and 18 cats.
18 x 4/5 = 14 2/5 or 14 and two fifths. Expressed as a decimal, this is equal to 14.4.