By how much is -20 less than 20

40

Step-by-step explanation:

20 - 40 = -20

Using zero as a reference point 20 is 20 units above zero and -20 is 20 units below zero.

20 + 20 = 40

-20 and 20 are 40 units away from each other.

-20 is 40 less than 20

I believe it is 37 humans and 37 horses

Step-by-step explanation:

Divide the heads by 2, it will equal 37 heads so 37 horse heads and 37 human heads. If they are at a horse race they need 1 human to ride 1 horse so therefore that is why i divides it by 2. (hope thats right)