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Algebra Difficulty 3.0 AMC 10/12 Prove it United Kingdom

A dealer bought two cars. He sold the first one for 40% more than he paid for it and the second one for 60% more than he paid for it. The total sum he received for the two cars was 54% more than the total sum he paid for them. When written in its lowest terms, the ratio of the prices the dealer paid for the first and the second car was a:ba : b. What is the value of 11a+13b11a + 13b?

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