How many 3 digits number are there which sum of digits is equal to 16.

• 100-200=4;
  200-300=5;
  ---------
  ---------
  700-800=10;
  800-900=9;
  900-999=8;
  Total= 66
• 9 years agoHelpfull: Yes(16) No(0)
• nos end with 9=7
  nos end with 8=8
  nos end with 7=9
  nos end with 6=9
  nos end with 5=8
  nos end with 4=7
  nos end with 3=6
  nos end with 2=5
  nos end with 1=4
  nos end with 0=3
  total = 66
  
• 9 years agoHelpfull: Yes(9) No(0)
• Combination of numbers
  9 7 0 = 4
  9 6 1 = 6
  9 5 2 = 6
  9 4 3 = 6
  
  8 8 0 = 2
  8 7 1 = 6
  8 6 2 = 6
  8 5 3 = 6
  8 4 4 = 3
  
  7 7 2 = 3
  7 6 3 = 6
  7 5 4 = 6
  
  6 6 4 = 3
  6 5 5 = 3
  
  Total = 66
  
  
• 9 years agoHelpfull: Yes(5) No(2)
• The correct ans. is 135
• 9 years agoHelpfull: Yes(2) No(5)
• 66
• 9 years agoHelpfull: Yes(1) No(1)
• 66
• 9 years agoHelpfull: Yes(1) No(1)
• https://en.wikipedia.org/wiki/List_of_perfect_numbers
• 9 years agoHelpfull: Yes(1) No(4)
• let me simplify this for u guys..first exclude the age of youngest one..i,e 6*30 + 23(remaining) -42(reducing the age of remaining 6 person) we will get 161(sum of ages of other 6 people when the young one was born)
  161/6 =26.8 is the average of other 6 persons when the young one was born!!
  
• 9 years agoHelpfull: Yes(1) No(0)
• Use permutation concept
  (556)=3!/2! =3 [because 2 no,s are common] [556,655,565]
  (574)=3!=6 [574,547,475,457,754,745]
  Similarly,
  (583)=3!=6
  (592)=3!=6
  
  (664)=3!/2!=3
  (673)=3!=6
  (682)=3!=6
  (691)=3!=6
  
  (772)=3!/2!=3
  (781)=3!=6
  (790)=4 [because 079 and 097 are not 3 digit numbers)
  Similarly,
  880,808 =2
  
  Total=57
• 9 years agoHelpfull: Yes(0) No(3)
• 66 is correct answer.
• 9 years agoHelpfull: Yes(0) No(1)
• First number =169
  second number =178
  Third number =187
  
  last number=970
  
  A.P. With d=9
  
  an = a +(n-1).d gives n=90
  
  so its 90. Correct .
• 9 years agoHelpfull: Yes(0) No(3)
• 84 is the answr
• 9 years agoHelpfull: Yes(0) No(1)