Ramu & Sangeetha went for biological analysis to an island which is 34km from their place. They traveled in a boat which went at a speed of 2m/s. when they are in half a distance in the boat Sangeetha noted there are 7 leg & 8 leg octopuses under the water. Ramu counted the total number of legs of octopuses and got 54. Sangeetha instantly said I know how many 7 legged octopuses are there under the water. They both reached the island after 20 min they left. How many seven legged octopuses does Sangeetha calculate?
a)2 b)5 c)6 d)7

• If there are
  
  x no of 7 leg & y no of 8 leg octopuses, then
  7x+8y= 54
  
  x can have even values to have final ans as 54 (even no)
  
  so checking values of x = 2,4,6
  
  we find that only x = 2 satisfies given condition for integer values of x and y.
• 13 years agoHelpfull: Yes(19) No(2)
• ans 2
  since 2*7=14
  54-14=40
  which is a multiple of 8.
• 13 years agoHelpfull: Yes(12) No(0)
• multiples of 7(legs) multiples of 8(legs)
  7 8
  14 16
  21 24
  28 32
  Here only 14legs(multiple of 7)+32legs(multiple of 8)=54legs
  So the question is to find the number of 7 legged Octopus.
  Then 14/7=2.
  Ans:(a)
  
• 13 years agoHelpfull: Yes(5) No(3)
• we can do it by options .first option =2
  total no of 7legged octopus=2
  total legs=7*2
  remaining legs=54-14=40
  and 40 is divisble by 8 therfore there are (40/8)=5 8legged octopus
• 12 years agoHelpfull: Yes(3) No(1)