In an examination, a student scores 4 marks for every correct answer and loses 1 mark for every wrong answer. If he attempts all 60 questions and secures 130 marks, the no of questions he attempts correctly is :
Let the number of correct answers be X.
Number of incorrect answers = (60 – X).
4x – (60 – x) = 130
=> 5x = 190
=> x = 38
If (cos2 θ -1)(1+tan2 θ)+2 tan2 θ =1, 0°<θ<90° then θ is:
The value of sin 30°cos 60°sin 60°cos 30°- tan 45° is
Solve the following
113 × 87 =?
In ΔABC measure of angle B is 90 deg. If tanA = 12/5, and AB = 1cm, then what is the length (in cm) of side BC?
ΔXYZ is right angled at Y. If m∠X = 60 deg, then find the value of (cotZ + 2)
If a3 = 93 + 1263+ 2173,then which of the following is correct?
Find the number of solutions a pair of linear equation (4x-9y+13=0 and 2x+3y-13=0) have.
Find the area (in sq units) of the triangle formed by lines x - 3y = 0, x – y = 4 and x + y = 4.
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