In an examination average marks obtained by the girls of a class is $85$ and the average marks obtained by the boys of the same class is $87 .$ If the girls and boys are in the ratio $4: 5,$ average marks of the whole class $(approx.)$ is closest to

  • A

    $85.9$

  • B

    $86.5$

  • C

    $86.4$

  • D

    $86.1$

Similar Questions

The mean of $100$ items was $46 .$ Later on, it was discovered that an item $16$ was misread as $61$ and another item $43$ was misread as $34.$ It was also found that the number of items was $90$ and not $100 .$ Then, what is the correct mean?

The average of $6$ numbers is $8.$ What is the $7^{th}$ number so that average becomes $10 ?$

If the average marks of three batches of $55,60$ and $45$ students respectively is $50,55$ and $60 ,$ then the average marks of all the students is

The average of three numbers of which greatest is $16$ is $12 .$ If the smallest is half of the greatest the remaining number is

After replacing an old member by a new member, it was found that the average age of five members of a club is the same assit was $3 \,year$ ago. The difference between the ages of the replaced and the new member is ? (in $year$)