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英语翻译In two years i will be four times older than my brother

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英语翻译
In two years i will be four times older than my brother is now,my brother is 5 now.HOW old will i be when i am twice as old as my brother?希望大家翻译之后还能给小弟算算这一题.
设我现在为X岁,有(X+2)=5×4=20,得X=18岁,
在设到那时我为Y岁,那么弟弟就Y/2岁,18-Y=5-Y/2,得Y=26岁