The sum of the 5 consecutive two digit odd number when divided by 10 becomes a perfect square, which of the following can be one of these 5 numbers?
option
a) 47
b) 91
c) 41
d) 67

• ans:41
  perfect square:- 1,4,9,16,25,36
  sum=square*10=10,40,90,160,250,360
  sum of 4 odd consecutive no is multiple of 4
  so only no left 40,160,360
  sum/4=40/4=10 not possible
  sum/4=360/4=90 not possible
  sum/4=160/4=40 option available i.e 41
  so no are 37+39+41+43=160.
  
  
• 11 years agoHelpfull: Yes(6) No(9)