There is a rectangular terrace whose length and width are 60m X 20m. There is a walkway of uniform width around terrace. Area of walkway is 516m^2. Find width of walkway:

a. 2
b. 3
c. 1
d. 2

• let the width be x
  then area of walkway is (60+2x)(20+2x)-(60x20)=510
  -->4x2+160x-516=0
  roots will be 3 and -43
  since it cannot be negative so answer will be 3
  
• 10 years agoHelpfull: Yes(19) No(1)
• Ans=3
  area=60*20=1200
  Area of left terrace=1200-516=684
  (60-x)*(20-x)=684
  =>x=3 or 43
• 10 years agoHelpfull: Yes(9) No(3)
• Let the width of the walkway be X
  (60+2*X)*(20+2*X)=1200+516
  when we solve this, we get X=3 which is the right answer.
• 10 years agoHelpfull: Yes(2) No(0)
• answer is 3. ie. B
  
• 10 years agoHelpfull: Yes(1) No(1)
• let width=d
  area=(60+2d)(20+2d)
  area-area of terrace=516
  (60+2d(20+2d)-1200=516
  then we will check by the option
• 10 years agoHelpfull: Yes(1) No(2)
• prachi pls tell...how you took area of walkway= 510????
• 10 years agoHelpfull: Yes(1) No(1)
• Let x=thickness or width
  total area=1200
  area excluding width=(60-x)(20-x)
  given,
  (60-x)(20-x)-1200=516
  x^2-40x-129=0
  x^2-43x+3x-129=0
  (x-43)(x+3)=0
  so,x=43,-3
  thickness should be positive.
  hence,x=43 Ans
  
• 10 years agoHelpfull: Yes(1) No(2)
• explain in good way ...
• 10 years agoHelpfull: Yes(0) No(1)