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今年小刚年龄的3倍与小芳年龄的5倍相等,10年后小刚年龄的4倍与小芳年龄的5倍相等。小刚今年多少岁?
Xiaogang this year, 3 times the age and Xiaofang 5 times the age equal to 10 years after Xiao Gang’s age 4 times and Xiaofang age 5 times equal. Xiaogang how old this year?