Question

好运来水果店运来8筐苹果和7筐橘子，橘子比苹果轻39千克。已知每筐苹果重25千克，每筐橘子重多少千克？

Answer 1

解：设每筐橘子重x千克。    
        25 ×8 -7x= 39     
           200 - 7x= 39     
                    7x= 200 - 39     
                    7x= 161     
                      x= 23