John is twice as old as Fred. Four years ago John was 6 times as old. How old is John?

Mathematics

2 answers:

kari74 [83]2 years ago

7 0

I think john is 10 years old hope that helps.

Crazy boy [7]2 years ago

7 0

These two equations from the question!
Fred + 6 = John , John + 4 = 2Fred

Now we’re going to use the 2nd equation:
John + 4 = 2Fred
(Fred + 6) + 4 = 2Fred
Fred + 10 = 2Fred
10 = Fred

Now we’re re going to use first equation:
Fred + 6 = John
10 + 6 = John

So, John is 16 years old!

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