Question 1085934
The ratio of Jonathan’s age to David’s age is 6:5. In seven years it will be 7:6. What are their ages now. 
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J/D = 6/5 --> 5J = 6D
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(J+7)/(D+7) = 7/6 --> 6(J+7) = 7(D+7)
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5J = 6D
6(J+7) = 7(D+7)
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Can you do the rest?