Counting legs at the meetup

EasyBrainteasers~3m

Chickens ( $2$ legs), cows ( $4$ legs), and spiders ( $8$ legs) gather, with $440$ legs in total. There are twice as many chickens as cows, and twice as many spiders as chickens. How many spiders are there?

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Let $w$ be the number of cows; write chickens and spiders in terms of $w$ .
$2(2w)+4w+8(4w)=40w=440$ , so $w=11$ and spiders $=4w$ .

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Counting legs at the meetup

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