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In a competitive examination, 1 mark is ...

In a competitive examination, 1 mark is awarded for each correct answer while 1/2 mark is deducted for every wrong answer. Jayanti answered 120 questions and got 90 marks. How many questions did she answer correctly?

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The correct Answer is:
100
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OSWAL PUBLICATION-PAIR OF LINEAR EQUATIONS IN TWO VARIABLES-NCERT Exemplar (Exercise-3.3)
  1. Solve the following pair of equations: 4x+ (6)/(y)=15, 6x- (8)/(y)= ...

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  2. Solve for x and y : (1)/(2x) - (1)/(y) = - 1, (1)/(x) + (1)...

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  3. Solve the following pair of equations: 43x + 67y= -24 67x + 43y=24

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  4. Solve the following pair of equations: (x)/(a)+ (y)/(b)= a +b, (x)/(...

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  5. Solve the following pair of equations: (2xy)/(x+ y)= (3)/(2), (xy)/(...

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  6. Find the solution of the pair of equations (x)/(10) + (y)/(5) - 1 = 0 ...

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  7. By the graphical method, find whether the following pair of equations ...

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  8. By the graphical method, find whether the following pair of equations ...

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  9. By the graphical method, find whether the following pair of equations ...

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  10. Draw the graph of the pair of equations 2x+y=4 and 2x-y=4. Write the v...

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  11. Write an equation of a line passing through the point representing sol...

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  12. If (x+1) is a factor of 2x^(3)+ax^(2)+2bx+1, then find the value of a ...

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  13. If the angles of a triangle are x, y and 40^(@) and the difference bet...

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  14. Two years ago, Salim was thrice as old as his daughter and six years l...

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  15. The age of the father is twice the sum of the ages of his two children...

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  16. Two numbers are in the ratio 5 : 6. If 8 is subtracted from each of th...

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  17. There are some students in the two examination halls A and B. To make ...

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  18. A shopkeeper gives books on rent for reading. She takes a fixed charge...

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  19. In a competitive examination, 1 mark is awarded for each correct answ...

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  20. The angles of a cyclic quadrilateral ABCD are angleA=(6x+10)^(@), angl...

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