SOLUTION: Zahid is 4 times as old as his brother. If 6 years later the difference in their ages will be 15 years. What is Zahid's age today?

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Question 732290: Zahid is 4 times as old as his brother. If 6 years later the difference in their ages will be 15 years. What is Zahid's age today?
Answer by josgarithmetic(39620) About Me  (Show Source):
You can put this solution on YOUR website!
z and b are their ages.

z=4b and z+6-(b+6)=15