Xiao Ming is 11 years old and his grandfather is 68 years old. In a few years, his grandfather will be four times as old as Xiao Ming? (equation solution)

In another x years, my grandfather is four times as old as Xiao Ming
68+X=4(11+X)
68+X=44+4X
3X=24
X=8
Eight years later, my grandfather is four times as old as Xiao Ming

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