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Calculate the mean of the scores of 20 students in a mathematics test

In a class test, the sum of the marks obtained by P in mathematics and science is 28. Had he got 3 more marks in mathematics and marks less in science, the product of marks obtained in the two subjects would have been 180. Find the marks obtained by him in the two subjects separately.

In a class test,the sum of the marks obtained by P in Mathematics and science is 28. Had he got 3 marks more in Mathematics and 4 marks less in Science.The product of his marks, would have been 180. Find his marks in the two subjects.

Out of 80 students who appeared in a combined test in science and Mathematics,64 passed in at least one subject.If 45 passed in science and 52 in maths then number of students failed in maths only is

Express each of the following in the language of ratios: In a class, the number of girls in the merit list of the board examination is two times that of boys. The number of students passing mathematics test is 2/3 of the number that appeared.