Question

there was a group of six students who took a test .another student joined the group after taking the test later .with her marks included the average score of the group went up by 3 .this student has gmmot marks more than the averge her being

Answer 1

Explanation:

LET THE AVERAGE BE `×´

× = TOTAL MARKS/ TOTAL NO. OF STUDENTs

TOTAL MARKS =6 × × _ _ _ _(1)

NOW INCLUDING A GIRL, AVERAGE INCREASED BY 3

(×+3) = TOTAL MARKS/7

TOTAL MARKS =7(× ×3) = 7× + 21

INCREASED MARKS =7×+21 - 6× =×+ 21

THE GIRL GOT 21 MARKS MORE THAN THE AVERAGE MARKS WITHOUT HER BEING INCLUDED

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