The average marks scored by Ajay in certain number of tests is 84. He scored 100 marks in his last test. His average score of all these tests is 86, then the total number of tests he appeared is:

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Solution

The correct option is C 8
$x_{1} + x_{2} + x_{3} + . . . + x_{n} = 84 x$
$\frac{84 x + 100}{x + 1} = 86$
$x = 7$
Total number of test $7 + 1 = 8$

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The average marks scored by Ajay in certain number of tests is 84. He scored 100 marks in his last test. His average score of all these tests is 86, then the total number of tests he appeared is:

The correct option is C 8x1+x2+x3+...+xn=84x84x+100x+1=86x=7Total number of test 7+1=8

The correct option is C 8
$x_{1} + x_{2} + x_{3} + . . . + x_{n} = 84 x$
$\frac{84 x + 100}{x + 1} = 86$
$x = 7$
Total number of test $7 + 1 = 8$