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sheila has 5 times as many markers as Dave. Together they have 18 markers. How many markers does Sheila have

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2 Answers

Dave has X markers, so Sheila has 5X markers. 
Adding up all markers, X + 5X = 6X.
There are 18 markers, so 6X=18. 
Dividing both sides of that equation by 6, we get X=3.
5X is 15.
 
So Dave has 3 markers and Sheila has 15 markers, for a total of 18 markers.