self Maths Puzzle

A Prof prepared an exam of 50 questions.For correct 1 mark,for wrong -1/3,for unanswered +1/6.A and B gave the test such that A’s all attempted questions are correct and B got atleast one question wrong.
Q1.the highest possible same score of A and B?
Q2.with highest possible same score ,how many questions does b got wrong?

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self Other Question

A Square of side 5 cm .the midpoints are joined to form a smaller square.this process is repeated.What will be the perimeter of 9th square? 248:3 :: 320: ?