Equation (x divided by1) x/1-300 = x/1.5-240 is solved to get x= 180. Ok, be sure to adopt it

4. Suppose that the apprentice has made X masters (x+ 10) equations: three fifths 3/5(x+ 10)=3/4x, x = 40,40 apprentices and 50 masters.

7. The original plan is that there are X equations (x-120) every day: 24x = (24+8) * (x-120), and x=480. I can't see the rest = = (Aha ~