My father is 24 years older than Xiao Li. Three years ago, my father was three times older than Xiao Li. Xiao Li, how old is my father this year,

My father is 24 years older than Xiao Li. Three years ago, my father was three times older than Xiao Li. Xiao Li, how old is my father this year,

X-Y = 24, x = 3Y, y = 12, x = 36, so dad is 39, Xiao Li is 15, you can also use, 24-3 = 21, 21x3 = 63, 63-24 = 39, 39 / 3 = 12,3, that is Xiao Li's age is 15

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