In an examination, a student scores 4 marks for every correct answer and loses I mark for every wrong answer. If he attempts in all 60 questions and secures 130 marks, the number of questions he attempts correctly, is:
Let the number of correct answers be X.
Number of incorrect answers = (60 – X).
Therefore, 4x – (60 – x) = 130
=> 5x = 190 => x = 38
If x = 283, y = 273 then the value of x + y - 1x2 + xy + y2 is
If tanα = 2, then the value of sinαsin3α + cos3α is
If 2 tan2θ = 6 and 0° < θ < 45°, then the value of sinθ + 3cosθ - 2tan2θ is
If x2 + y2 + z2 = 14 and xy+ yz + zx = 11, then the value of (x + y + z)2 is
1a - 1b = 0, then the value of 1a + 1b is
Simplify the following expression:
Express in meters the sum of 0.5035 km, 332.9 cm, and 1771mm:
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