SOLUTION: Andrew is 4 years older than Amber. In 4 years the sum of their ages will be 46. How old is Andrew now?

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Question 607122: Andrew is 4 years older than Amber. In 4 years the sum of their ages will be 46. How old is Andrew now?
Answer by lawdej(58) About Me  (Show Source):
You can put this solution on YOUR website!
let Andrew's age be a and Amber's age be b
a=4+b this means b=a-4
a+4+b+4=46
a+4+a-4+4=46
2a=46-4
2a=42
a=42/2
a=21
so andrew is 21 years old