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How old are Doris and Dave now when Doris is 3 times the age of Dave but in 4 years time Doris will be twice the age of Dave showing work?
Wiki User
∙ 8y ago
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
Wiki User
∙ 8y ago
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