Bill has twice the number of books as bob does. together they have 52 books. how many books does bill have?

Bill has 13 books. Bob has 26 books.

Step-by-step explanation:

52 divided by 2 = 26

26 divided by 2 = 13

13 x 2 = 26 and 26 + 26 = 52

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so: