Class VIII

(469 + 174)2 - (469 - 174)2 = ? (469 x 174)
  1. 2
  2. 4
  3. 295
  4. 643
There are two examinations rooms A and B. If 10 students are sent from A to B, then the number of students in each room is the same. If 20 candidates are sent from B to A, then the number of students in A is double the number of students in B. The number of students in room A is:
  1. 20
  2. 80
  3. 100
  4. 200
A man has Rs. 480 in the denominations of one-rupee notes, five-rupee notes and ten-rupee notes. The number of notes of each denomination is equal. What is the total number of notes that he has ?
  1. 45
  2. 60
  3. 75
  4. 90
A man has some hens and cows. If the number of heads be 48 and the number of feet equals 140, then the number of hens will be:
  1. 22
  2. 23
  3. 24
  4. . 26
David gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Albert gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross ?
  1. 19
  2. 28
  3. 30
  4. 37
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