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You are four times older than your son In twenty years of time your age will be twice as your son ' s age Calculate my son ' s age?
Wiki User
∙ 14y ago
This can be written as an equation
On the one side we have:
4s which means 4 x the age of my son.
This is the same as
2s+20 which means in 20 years I will be 2 x the age of my son.
Since I and my son do not change, both statements must be true so:
4s = 2s+20
We need to find s, so rearrange to get s on one side on its own:
4s - 2s = 20
2s = 20
s = 20 / 2
s = 10
My son is 10 years old.
To check this is correct use the answer in both the original statements to see if they are still true.
4 x 10 = 40 years. I am 40 years old.
in 20 years my son will be 30 and I will be 60. I will then be twice as old as my son.
Wiki User
∙ 14y ago
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