Question
In an examination, 4 marks are given for each correct
answer and 1 mark is deducted for each wrong answer. If a candidate solved 75 questions and got 125 marks, then how many of his answers were correct?Solution
Total questions: x + y = 75. Total marks: 4x- y = 125. Substitute y =75-x into the second equation: 4x -(75-x) = 125 5x-75 = 125 5x =200 x=40 Thus, Â the candidate answered 40 questions correctly.
28         57           172           689          ?              20677
...14 26 50 98 194 ?
...5                             6                             14              �...
89Â Â Â Â Â 78Â Â Â Â Â 74Â Â Â Â Â 67Â Â Â Â Â 63Â Â Â Â ?
100Â Â Â Â 221Â Â Â Â 77Â Â Â Â 245Â Â Â Â 50Â Â Â 275
Identify the logic of the below given series and given answer.
Series I :: 1840, 1719, (P), 1694, 1890, 1665, 1921
Series II :: 175, 4...
(45)2 ÷ ∛729 + (35)2 ÷ 1.4 =?
17                          26                          37                   �...
25 30 300 315 6300 ?
...2, 12, 90, 240, ?, 1260
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