All paperback books cost d dollars each and all hardback books cost 2d dollars each. If Kate paid 7d dollars for 5 books, how many paperback books did she buy?

I'm having trouble setting up an equation to solve this. I know the answer should be 3.

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- May 27th 2012, 06:56 AMmjoshuaAmount/cost word problem
All paperback books cost d dollars each and all hardback books cost 2d dollars each. If Kate paid 7d dollars for 5 books, how many paperback books did she buy?

I'm having trouble setting up an equation to solve this. I know the answer should be 3. - May 27th 2012, 07:12 AMskeeterRe: Amount/cost word problem
let x = number of paperbacks purchased

dx + 2d(5-x) = 7d

x + 2(5-x) = 7

solve for x - May 27th 2012, 07:17 AMmjoshuaRe: Amount/cost word problem
Thanks skeeter! Makes so much more sense now!