Question
There are two classrooms, A and B. If 20 students are
shifted from A to B, the number of students in each room becomes the same. If 30 students are sent from B to A, the number of students in A becomes thrice the number of students in B. Find the number of students in each classroom.Solution
Let students in A = a, in B = b. From first condition: a - 20 = b + 20 => a - b = 40 ...(i) From second condition: a + 30 = 3(b - 30) => a + 30 = 3b - 90 => a - 3b = -120 ...(ii) Subtracting (ii) from (i): (a - b) - (a - 3b) = 40 - (-120) => 2b = 160 => b = 80 Substitute b in (i): a - 80 = 40 => a = 120
3 5 15 75 1125 ?
...If 7             16      x    90       171          292
Then, 2x 2 +  1 + x ...
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
...219 365 511 ? 803 949
...12 11 18 34 89.5 259.5
...A series is 48, 129, 298, 587, 1028, 1653
If another series 150, ___, m, ___, follows the same pattern as the given number series, then find th...
Choose the correct alternative
21: 3 ∷ 574: ?
72 85 103 126 154 ?
...63 189 315 378 567 693
...-3 -10 -40 -185 -905 -4500
-4 a b c d e
Find the value of d.
...
