so we know she has sculptures and paintings, if she sold twice as many paintings as sculptures, that means that for every 2 paintings, she sold 1 sculpture, so the paintings and sculptures are on a 2:1 ratio.
we know she sold a total of 57, so we'll need to split 57 in a 2:1 ratio, we'll simply divide the whole amount of 57 by (2+1) and distribute accordingly.

Answer:
n≥15
Step-by-step explanation:
3n≥45
/3 /3
n≥15
Skewlines have opposite reciprocal slopes ,and parallel lines have opposite reciprocal slopes