Question

1/3 of animals are cows, 1/4 are sheep, 1/5 are horses, 1/6 are deer and 4 dogs. How many animals are there altogether?

Answer 1

80

Explanation:

First, let's mark all animals as x. Now we can form an equation:

`(1)/(3) x + (1)/(4) x + (1)/(5) x + (1)/(6) x + 4 = x`

Then, let's multiply this whole equation by 60, since it's a common denominator:

20x + 15x + 12x + 10x +240 = 60x

57x = -240 + 60x

57x - 60x = -240

-3x = -240 / : (-3)

x = 80