Mathematics Olympiad for Sponsorship

Compute ( )＋7＝20. ( )＝?

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Given an expression that 16＋( )＞30. What is the minimum number in ( )?

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If the equation 24＝3×8＝□×4 is established, □＝( ).

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Given that 5 trophies are placed in a row. Suppose trophy A is on the right of trophy B, trophy E is on the right of trophy C, trophy D is on the right of trophy A, and trophy C is on the right of trophy D, which trophy is in the middle?

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There are 10 problems for the math quiz. Suppose 8 points will be given for each correct answer, and 2 points will be lost for each wrong answer, how many wrong answers does Mary write if she gets 50 points?

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