A man is 37 years old; his two sons are 8 years and 3 years old. after how many years will he be twice as old as their united age?

Man=37 ,Son(1)=8 and Son(2)=3

After x year

Therefore ,

$\\(37+x)=2[(8+x)+(3+x)]\\ \\\Rightarrow 37+x=2(11+2x)\\ \\\Rightarrow 37+x=22+4x\\ \\\Rightarrow 3x=15\\ \\\Rightarrow x=5$

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