Q. A shopkeeper arranges his fruits in such a way that putting either 3,or 9,or 7 apples in a row, each time one apple is left out. But when he puts 11 apples in a row, number apple is left. Find the number of apples.

• 253 apples
  
  Explanation:
  
  [(9*7*n)+1]%11 should be zero
  
  try n = 1,2,3,4,5....
  
  it satisfies when n=4 i.e. (9*7*4)+1 = 253 => 253%11 = 0
  
  253 = 252 + 1 = (84 * 3) + 1
  253 = 252 + 1 = (28 * 9) + 1
  253 = 252 + 1 = (36 * 7) + 1
  253 = 23 * 11
• 10 years agoHelpfull: Yes(0) No(0)