A typical cow may weigh around 1000 pounds, so that is 1000000/1000 = 1000 cows
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4 of each. Horses: 28 + 4 = 32 Cows: 36 + 4 = 40 Horses: cows = 32 : 40 = 4 x 8 : 5 x 8 = 4 : 5
If all animals were horses there would be 4 x 59 ie 236 legs. There is a shortage of 25 legs so there are 25 cows (and 34 horses).
Do-it-in-your-head method: If all animals were chickens there would be 90 legs. There are 20 extra legs, each on a cow, so there are 20 cows and therefore 25 chickens.
If all the animals were horses there would be 360 legs. There is a shortfall of 23 which means 23 cows and therefore 67 horses.
four cows passed away