Question

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Q.19) Ravi took a test which has 50 questions. The total grade was computed by awarding 10 points for each
correct answer and deducted 5 points for each incorrect answer. He answered all 50 question and received a
score of 350. How many wrong answer did he attempt.
रवी ने एक परीक्षा दी जिसमें 50 प्रश्न थे। सही उत्तर पर 10 अंक मिलते है, तथा गलत उत्तर पर 5 अंक काट लिए जाते है इस प्रकार परिणाम
तैयार किया गया। रवी को सभी 50 प्रश्न हल करने पर 350 अंक मिले। उसने कितने उत्तर गलत कितो?​

Answer 1

Step-by-step explanation:

x= Correct answers

y= wrong answers

x + y = 50 (because total questions are 50)

10x - 5y = 350 (Each correct answer awarded 10 points minus 5 points deducted for each wrong answer)

Solving by Elimination method:

10x + 10y = 500

10x - 5y = 350

Therefore 15y= 150

y=10

So he gave 10 wrong answers and 40 correct answers

Answer 2

Answer:

The number of wrong answers he attempted is 10.

Step-by-step explanation:

let x be correct answers

let y be wrong answers

therefore,

10x - 5y=350 --(1)

   x + y  =50 ----(2)

------------------------

(1)         --- 10x - 5y = 350

(2) x 10 --- 10x + 10y=500

                 (-)     (-)      (-)  

---------------------------------------

                         -15y=-150

                          15y=150

                             y=150/15

                             y=10

              Therefore, The number of wrong answers he attempted is 10.