Question

In a pet store the number of birds is 10 less than twice the number of rabbits. if the pet store has 56 birds, how many rabbits does it have?

Answer 1

b = 2r - 10
b = 56

56 = 2r - 10
56 + 10 = 2r
66 = 2r
66/2 = r
33 = r <=== there are 33 rabbits

Answer 2

There are 56 birds. And there are 10 less than twice the number of rabbits

let rabbits = r

2r - 10 = 56

Note the equal sign. What you do to one side, you do to the other. Do the opposite of PEMDAS. Isolate the r.

add 10 to both sides

2r - 10 (+10) = 56 (+10)

2r = 66

Divide 2 from both sides

2r/2 = 66/2

r = 33

33 is your answer

hope this helps