Question
A teacher distributes 300 toffees among her 4 students,
A, B, C and D. A gets x% of total toffees, B receives 2x% of the remaining toffees, C receives (x + 5)% of the remaining toffees and D receives 108 toffees. Find the value of x?Solution
Number of toffees received by A = x% of 300 Number of toffees received by B = 2x % of (100 – x)% of 300 Number of toffees received by C = (x + 5)% of (100 – x)%× (100 – 2x)% of 300 
(100 – x) × (100 – 2x) × (95 – x) = 36 × 100 × 100 By putting the values from option, we find out that x = 20 satisfies the above equation. Hence, option c) is the correct answer.
12, 6, 6, 9, 18, ?
77 ? 190 257 331 412
...10 625 50 125 250 25 ?
...90     211     67     236     ?     265
...1335Â Â Â Â Â Â 737Â Â Â Â Â Â Â Â 355Â Â Â Â Â Â Â Â 141Â Â Â Â Â Â Â Â 47Â Â Â Â Â Â Â Â Â Â ?
...Which of the following numbers will replace the question mark (?) in the given series?
69, 70, 74, 83, ?, 124
15Â Â Â Â Â Â Â Â Â Â Â Â 13 Â Â Â Â Â Â Â Â 28 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 24 Â Â Â Â Â Â Â Â Â Â Â Â Â Â 54 Â Â Â Â Â Â Â Â 52
...4, 8, 24, ?, 840, 9240
If 6 4 x 5.75 9,
Then, (x²-1) = ?
...13 22 40 67 103 ?
...
