Lucia is a wonderful grandmother. Her age is between 50 and 70.Each of her sons have as many sons as they have brothers. Their combined number gives Lucia

a)55
b)64
c)73

Answer is 64

• let licas has x no of sons ,let her sons have x no of sons
  then x*x (only b option satisfies) ie x*x=64
  ans =64
• 10 years agoHelpfull: Yes(4) No(0)
• x+x(x-1)==>combined no
  solving ,we get x^2
  only b) satisfies the equatn
• 10 years agoHelpfull: Yes(2) No(0)
• each son have as many sons as they have brothers...........means it must be a square
  
• 10 years agoHelpfull: Yes(2) No(0)
• Let lucia has X number of sons.
  => X number of sons have x-1 number of sons each.
  their combined number is x**(x-1)+x is in range 50-70.
  By trial and error method her age is 64
• 9 years agoHelpfull: Yes(0) No(0)