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41.
In an examination, a student score 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 75 questions and secures 125 marks, the number of questions he attempts correctly is

35

40

42

46

Let the number of correct questions attempted be x.
Then, the number of wrong questions attempted be (75 - x)
According to the question,
x x 4 - (75 - x) x 1 = 125
⟹ 4x - 75 + x = 125
⟹ 5x = 200
⟹ x = 40

36 Views

42.

Find a number, one-seventh of which exceeds its eleventh part by 100.

1925
1825
1540
1340

35 Views

43.

If $9 square root of straight x space equals space square root of 12 space plus space square root of 147 comma$ then x = ?

74 Views

44.

The value of $3 plus fraction numerator 1 over denominator 3 plus begin display style fraction numerator 1 over denominator 3 plus begin display style 1 third end style end fraction end style end fraction$ is

$40 over 11$
$43 over 11$
$46 over 11$
$41 over 11$

31 Views

45.

The value of $fraction numerator left parenthesis 3.2 right parenthesis cubed minus 0.008 over denominator left parenthesis 3.2 right parenthesis squared space plus space 0.64 space plus space 0.04 end fraction$ is

0
2.994
3.208
3

29 Views

46.

Mohan gets 3 marks for each correct sum and loses 2 marks for each wrong sum. He attempts 30 sums and obtains 40 marks. The number of sums solved correctly is

33 Views

47.

If $2 plus straight x space square root of 3 space equals space fraction numerator 1 over denominator 2 plus square root of 3 end fraction comma space$ then the simplest value of x is

1
-1
-2
2

48.

If $fraction numerator open square brackets 2 open parentheses begin display style fraction numerator 4 straight x over denominator 5 end fraction end style minus begin display style 3 over 4 end style close parentheses close square brackets over denominator 3 minus begin display style 5 over 3 end style end fraction space equals space minus 1 over 6 comma$ then the value of x is:

$4 over 15$
$negative 15 over 4$
$negative 4 over 15$
$15 over 4$

49.

If $fraction numerator 2 straight x over denominator 3 end fraction minus fraction numerator open square brackets 5 open parentheses begin display style fraction numerator 4 straight x over denominator 5 end fraction end style minus begin display style 4 over 3 end style close parentheses close square brackets over denominator 2 end fraction space equals space 1 third comma$ then what is the value of x?