The big brother is 4 years old, the little brother is half his age, how old would the little brother be when the big brother is 100 ?
哥哥4岁的时候，弟弟的年龄是哥哥的一半，那么哥哥100岁的时候弟弟几岁？
The big brother is 4 years old, the little brother is half his age, how old would the little brother be when the big brother is 100 ?
哥哥4岁的时候，弟弟的年龄是哥哥的一半，那么哥哥100岁的时候弟弟几岁？
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