i saw 8 bats flying in the air. i saw some bats hanging in a cave. i saw a total of 15 bats. how many bats did i see hanging in a cave ?

Question

I need two equations to equal when added together  15 one being subtracting one being addinf 

Answer 1

Let x = the number of bats hanging in a cave.

x + 8 = 15

x = 7

or

15 - x = 8

-x = -7

x = 7