7th Grade Challenging Math

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7-11)   Answer

           5 subjects

Solution: The difference between the English score and the average of the other subject test scores is 98 - 88 = 10;

The increase in average score when English is include is 90 – 88 = 2; The number of tests is (98 - 88) ÷ (90-88) = 10 ÷ 2 = 5 subjects