Question
In a competitive examination containing 200 questions, 2
marks are awarded for every correct answer and 1 mark gets deducted for every wrong answer. If a student attempted all questions and obtained 97 marks, how many wrong answers must he have given?Solution
Let number of questions with right answers = x ∴ No. of questions with wrong answers = 200 – x ∴ Marks obtained for right answers = 2x ∴ Marks deducted for wrong answers = 200 – x ∴ 2x - (200 – x) = 97⇒ 3x = 200 + 97 ⇒ 3x = 297 ∴ x = 99 ∴ No. of questions with wrong answers (200 – 99) = 101
Select the mirror image of the following figure (note the position of the mirror).

Which two numbers should be interchanged to make the given equation correct?
69 + 15 β (14 Γ 4 ) Γ· 2 + (48 Γ· 3) = 58
(NOTE: Numbers m...
Which of the following terms will replace the question mark (?) in the given series?
GASM, CCOO, YEKQ, ? , QICUΒ
Select the number from among the given options that can replace the question mark (?) in the following series.
16, 35, ?, 217, 653, 1309
Select the set in which the numbers are related in the same way as are the numbers of the following sets.
(NOTE : Operations should be performed ...
Select the option that is related to the third number in the same way as the second number is related to the first number.
576:384 β· 765: ?
By interchanging which two signs and two numbers (not digits) the equation will be correct?
8 β 4 Γ 9 + 6 Γ· 3 = 29
Select the figure from the options given below that can replace the question mark (?) and complete the pattern.Β
If β+β means βββ, βββ means βΓβ, βΓβ means βΓ·β, and βΓ·β means β+β, what will come in place of the question mark ...