修路队修一条水渠,前8天平均每天修51M,后5天共修294M.平均每天修多少米?

问题描述:

修路队修一条水渠,前8天平均每天修51M,后5天共修294M.平均每天修多少米?

51×8=408(米)
(408+294)÷(8+5)
= 702÷13
=54(米)