Class VI

A number for which sum of all its factors is equal to twice number is called 
  1. Perfect number 
  2. Even number 
  3. Odd number 
  4. Prime number 
Identify the perfect number.
  1. 25
  2. 64
  3. 28
  4. 72
 Find out the number of twin primes between 20 to  40.
  1. 4
  2. 3
  3. 1
  4. 2
Identify the number between 11 and 25 which is a multiple of 6 and is also a common factor of 72 and 126.
  1. 14
  2. 22
  3. 18
  4. 21
Seema jogs every third day and swims every fifth day. She did both this morning. When will she next do both?
  1. tenth day
  2. fifteenth day
  3. twentieth day
  4. eighth day 
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