Question

5 mark for✓ (-2) mark for × Sara score 24 marks how much she attended×if she gets 14ans ✓

Answer 1

Answer:

Step-by-step explanation:

LETS TAKE THE RIGHT ANS TO BE X AND WRONG ANS TO BE Y

THEN, THE EQUATION FORMED IS;-

  5X - 2Y = 24   ( AS SHE GOT 24 MARKS )

  IT IS GIVEN THAT SHE HAD 14 CORRECT ANS.

  :- ON SUBSTITUTING THE VALUE OF X AS 14 , WE GET

   5 * 14 - 2Y = 24

    70 - 2Y = 24

     -2Y = 24 - 70

     - 2Y = -46

      Y = 23      ( MINUS SIGN GETS CANCELLED)

SHE ATTENED 23 WRONG ANS.

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