R If you do it all, you won't get 5 if you make a mistake of 1, but you will get 1, which will actually deduct 6 points. 1 00-70 = 30, which is equivalent to a mistake of 30/6=5, so he got 20-5 =/correctly. Some questions have not been done, at least answer correctly 10. That is, 10 is correct, 10*5=50, 10 is not answered,10 * 2 = 20,50+20 = 70.