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If there were 4u scuptures were displayed, there were ( 305 – 4u ) paintings on display.

1/4*4u = u sculptures were sold and (305 – 4u)/3 paintings were sold .

Given 

u = (305 – 4u)/3 + 15           multiply both sides by 3

3u = 305 – 4u + 45

7u = 350

u = 50

4u = 200

200 sculptures were displayed at the exhibition.

 

Check: 200/4 = 50 

305 – 200 = 105

105/3 = 35

50 -35 = 15 checked

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