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?
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Answer:
Equation= 2x + x = 18.
Answer = 6.
Step-by-step explanation:
Let the no. of books David has be x.
No. of Books Maria has = 2x
Equation = 2x + x = 18
David's books :
= 2x + x = 18
= 3x = 18
= x = 18÷3
= x = 6
Therefore, No. of books David has :
= x
= 6 Books.
Therefore, No. of books Maria has :
= 2x (2×6)
= 12 Books.
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