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Ravi scored 40 marks in a test, getting 3 marks for each right answer and losing 1 mark for each wrong answer. Had 4 marks been awarded for each correct answer and 2 marks been deducted for each incorrect answer, then Ravi would have scored 50 marks. How many questions were there in the test?
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Sagot :

Answer:

Step-by-step explanation:

3x-y=40

3x-40=y

y=3x-40

4x-2y=50

2(2x-y)=50

(2x-y)=25

2x-y=50/2

2x-y=25

2x-3x-40=25

2x-3x=25-40

-x=-15

x=15

3x-y=40

3(15)-y=40

45-y=40

45-40-y=0

45-40=y

5=y

x=15

x+y = 15 + 5 = 20

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