红红家养鸡750只,养鹅的只数相当于鸡的五分之二,养鸭的只数是鹅的四分之九.养鸭几只?

问题描述:

红红家养鸡750只,养鹅的只数相当于鸡的五分之二,养鸭的只数是鹅的四分之九.养鸭几只?

750X2/5X9/4=650只

750x2/5x9/4
=300x9/4
=675只

750×2/5×9/4
=300×9/4
=675(只)
答:养鸭675只.