Mark is 4 years older than Frank. Frank's age is 4/5 Mark's age. What are their ages?
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22schaeju:
is that even considered an answer....?
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Answer:
Step-by-step explanation:
let x be Mark's age and let y be Frank's age. We have:
x = 4 + y and y = 4x/5, then
x = 4 + 4x/5
5x = 20 + 4x
x = 20 and y = 16.
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