Photo Albums. Photo Perfect prints pages of photographs for albums. A page containing 4 photos costs $3 and a page containing 6 photos costs SS Ann can spend no more than $90 for photo pages of her recent vacation, and she can use no more than 20 pages in her album. What combination of 4-photo pages and 6-photo pages will maximize the number of photos that she can display? What 1s the maximum number of photos that she can display?
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