A rectangular field is 300 feet wide and 400 feet long. Random sampling indicates that there are, on the average, three ants per square inch throughout the field. [ 12 inches = 1 foot. ]Of the following, the number that most closely approximates the number of ants in the filed is: [DCRU]
A. 500000
B. 50 Million
C. 500 Million
D. 5 Million

• Rectangle area : Length X Breadth
  
  Length=400 , Breadth=300
  
  So, area in sq.feet is 400 x 300 = 120000
  
  Ants per inch = 3
  
  we have to convert area into sq.inches..
  
  Area in sq.inches is 120000 x 12 x 12= 17280000
  
  No. of ants in the field is 17280000 x 3 = 51840000 (approx. 50 million)
• 10 years agoHelpfull: Yes(30) No(0)
• Ans:5 million
  12 inches = 1 foot
  =(300*12)*(400*12)*3
  =(10^4*3*12*4*12)*3
  =5 million...
  
• 10 years agoHelpfull: Yes(9) No(16)
• D 5million
  
• 10 years agoHelpfull: Yes(3) No(4)
• the ans is 50 million
• 10 years agoHelpfull: Yes(3) No(0)
• B.50 million
• 10 years agoHelpfull: Yes(1) No(1)
• LENGTH=4800inch
  WIDTH=3600inch
  area=(48*36)*10000sqr inch
  since 1sqr inch contain 3ant
  thus, ant will be 3*area i.e. 5.184million
  thus D is right ans.
  
• 10 years agoHelpfull: Yes(1) No(0)
• its D
  3600inch*4800inch=1728*10^4
  1728*10^4 *3 ant=5 million
  
• 10 years agoHelpfull: Yes(1) No(0)
• area of rectangular=l*b
  l=400,b=300 feet
  area=120000feet=120000*12 inches=1440000 inches
  1 inch=3 ants
  so 1440000*3=4320000 ants=5 m
  ans=5m option D
  
• 10 years agoHelpfull: Yes(1) No(0)
• 5 million
  
• 10 years agoHelpfull: Yes(1) No(0)
• area of the field=(300*12)*(400*12)=17280000inch.sq
  so no . of ants in the field=area*3=51840000=50 million ants(approx)
• 10 years agoHelpfull: Yes(1) No(0)
• Area of rect is 300*400=120000 sq ft.. Convert it into inches...
  120000*12=1440000 sq inches. Nw since in a each sq inch 3 ants reside . then no of ants in total area is 1440000/3= 500000.(app).. So and A is correct
• 10 years agoHelpfull: Yes(1) No(0)
• we have convert feet to inches before finding area of rectangle....hence answer is 50 million
• 10 years agoHelpfull: Yes(1) No(0)
• 5 million..
• 10 years agoHelpfull: Yes(0) No(2)
• b.50 M
  
  
  
  
• 10 years agoHelpfull: Yes(0) No(0)
• B 50 million
• 10 years agoHelpfull: Yes(0) No(0)
• 50million
  
• 10 years agoHelpfull: Yes(0) No(0)
• the area of the field in square inches is given by 12*300*12*400 = 17,280,000 square inches
  three ants per square inches on an average implies 17,280,000 * 3 ants in the field = 51,840,000 ~ 50 million
• 9 years agoHelpfull: Yes(0) No(0)