How to do the last question on page 1 9 of the seventh grade math exercise book of Zhejiang Education Edition?
Let the desktop be x and the legs be y, then according to the meaning of the question, 4x=y,
X/5+y/30=25, the solution is X=75, Y=300, that is, 75 desktops and 300 legs are made of 25 cubic meters of wood, and they happen to be 75 square tables! ! !