设我今年X岁,则爷爷6X岁,爷爷永远比我大60岁6X-X=60X=126X=72
设我x岁6x+4-60=x+4x=12所以我12岁,爷爷72岁~~~~~~~~~~~~~~~~~~~~~祝你进步,有疑问可追问,请及时采纳~~~~~~~~~~~~~~~~~~~~