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Let Dave's age now be x and Doris' age now be 3x

But in 4 years time Dave will be x+4 and Doris will be 3x+4 which is twice Dave's age

So: 3x+4 = 2(x+4) => 3x+4 = 2x+8 => x = 4

Therefore: Dave is now 4 years of age and Doris is now 12 years of age

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9y ago

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