Question

Marie has twice as many books as David has. Together they have 18 books. Which of the following equations can be used to find the number of books that David has?

Answer 1

Answer:

here is your answer.

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Answer 2

Answer:

Let x be the no. of books David has,

and 2x be the no. of books Marie has.

So,

no.of books Marie has+no.of books David has=18

2x+x=18

3x=18

x=18 divided by 3

x=6

therefore,

no of books marie have=2x

=2 multiply into 6

=12 books

no. of books david have=x

=6books

CHECK:12+6=18(correct)

THE EQUATION THAT CAN BE USED IS 2x + x=18