Question
A candidate just passed by getting 15 answers correct by
attempting 25 of the total questions. Find the total number of questions in the examination if a candidate needs 60% marks. (All questions carry equal marks)Solution
Let the total number of questions be x. then, Percentage need in exam = 60% marks obtained = 15 percentage = (marks obtained)/(total marks)
100 60 =
100 x = 25 Alternate method Given that 15 ≡ 60% 1 ≡ 4% 25 ≡ 100%
total number of questions = 25
Find the wrong number in the given number series.
16, 24, 36, 54, 81, 120.5
- 2024, 1583, 1193, 822, 498, 209
33Â Â Â Â 34Â Â Â 37Â Â Â 42Â Â Â 48Â Â Â 58
66, 115, 34, 155, 14, 211
360, 322, 286, 248, 220, 190
- Find the wrong number in the given number series.
7, 35, 42, 126, 128, 118 - Find the wrong number in the given number series.
2, 6, 14, 30, 62, 126 Find the wrong number in the given number series.
134, 163, 194, 231, 274, 315
125, 142, 199, 320, 489, 778
Find the wrong number in the given number series.
32, 48, 84, 146, 248, 392