Solve algebra problema

Question

Sue bougt 1 pair shoes, 2 dresses and 4 skirts. The total was 310$. The skirt cost 15 less than dress. The shoes 2 times the skirt. What is price for each item

Answer 1

x+2y+ 4z=310

z=y-15

x=2z

2z+2(z+15) +4z=310

8z= 310-30 =280

z=280/8 = $35 per shirt

x=2z=$70 per shoes

y=z+15=$50 per dress