Answer:
if she build x numbers of large decks, therefore small decks would be (x + 5)
1500*(x+5)+2500x  =23500
1500x+7500+2500x=23500
4000x+7500 Â Â Â Â Â Â =23500
            4000x=23500-7500
             4000x=16000
                 x=4
4+5=9
cho built 4 large decks and 9 small decks