设鹤女x岁,鹤父2x,龟孙y,龟祖5y
(3x+6y)*3=900
十年后鹤女x+10岁,鹤父2x+10,龟孙y+10,龟祖5y+10
5*(3x+20)+6y+20=900
化简的
x+2y=100
5x+2y=260
2-1得4x=160,x=40
带入1,y=30
所以鹤女40,鹤父80,龟孙30,龟祖150
设鹤女x岁,鹤父2x,龟孙y,龟祖5y
(3x+6y)*3=900
十年后鹤女x+10岁,鹤父2x+10,龟孙y+10,龟祖5y+10
5*(3x+20)+6y+20=900
化简的
x+2y=100
5x+2y=260
2-1得4x=160,x=40
带入1,y=30
所以鹤女40,鹤父80,龟孙30,龟祖150