A rope makes 125 rounds of a cylinder with base radius 15 cm. How many time can it go round a cylinder with base radius 25 cm?
(a) 100
(b) 75
(c) 80
(d) 65

• 15cm -> 125 round
  25 cm -> ?(x) round
  more lenth less round (indirect proportion- chain rule)
  
  25:15::125:x
  x= 15*125/25
  x=75
• 9 years agoHelpfull: Yes(2) No(0)
• ans-75
  2*22/7*15*125=2*22/7*25*x
  25*x=125*15
  x=75
• 10 years agoHelpfull: Yes(0) No(0)
• let the required number of rounds be X.
  
  more radius, less rounds(inverse proportion)
  
  Radius in cm= Round
  
  15=125
  25=x
  x=(15*125)/25
  x=75 rounds
• 5 years agoHelpfull: Yes(0) No(0)