In copying a second degree equation the number without 'x' was written as '-30' instead of 30. The answers found were 15 and '-2'. What are the answers of the correct problem?

In copying a second degree equation, the number without 'x' was written as 24 instead of '-24'. The answers found were 4 and 6 . What are the answers of the correct problem?

In writing the equation to construct a rectangle of specified perimeter and area, the perimeter,was wrongly written as 24 instead of 42.The length of a side was then computed as 10 metres.What is the area in the problem?What are the lengths of the sides of the rectangle in the correct problem?

An examination has 25 questions. Each correct answer gets 2 marks, for each wrong answer 1 mark is taken away. If answer is not written no marks will get. In this examination if one scored 6 answers are correct and 19 answers are wrong and other 5 answers are correct and 15 wrong and 5 are not answered. Who got more marks?

I5cc of liquid 'X' is mixed with '15 cc of liquid 'Y'. The volume of the resulting solution is found to be '30.1 cc .' What is the nature of the resulting solution?

In an experiment with 15 observations on x, the following results were available Sigma x^(2)=2830 , Sigma x=170 On observation that was 20, was found to be wrong and was replaced by the correct value 30. Then, the corrected variance is