Question
The ratio of Eric's total marks to that of Billy's in the test was 7 : 8. In the next test, Eric's marks increased by 70%. By what percentage must Billy's marks be increased if their total marks were to be the same? Round off your answer to the nearest whole number.
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The ratio of Eric's total marks to that of Billy's in the test was 7 : 8. In the next test, Eric's marks increased by 70%. By what percentage must Billy's marks be increased if their total marks were to be the same? Round off your answer to the nearest whole number.