There are 5 boxes in a cargo. The weight of the 1st box is 200KG, the weight of the 2nd box is 20% higher than the third box, whose weight is 25% higher than the 1st box weight. The 4th box which weighs 350KG is 30% lighter than the 5th box. Find the difference in average weight of the 4 heaviest boxes and the four lightest boxes.

• weight of 1st box=200
  weight of 3rd box=(125/100)*200=250
  weight of 2nd box=(120/100)*250=300
  weight of 4th box =350
  weight of 5th box=(10/7)*350=500
  average of 4 highest weihted boxes=(500+350+300+250)/4=350
  average of 4 lightest boxes=(350+300+250+200)/4=275
  therefore difference=350-275=75
• 11 years agoHelpfull: Yes(24) No(1)
• @PRE
  GIVEN THAT The 4th box which weighs 350KG is 30% lighter than the 5th box.
  SO (70/100)% WEIGHT OF 5TH BOX IS EQUAL TO WEIGHT OF 4TH BOX
  SO WEIGHT OF 5TH BOX =(100/70)350 WHICH IS EQUAL TO 500
• 11 years agoHelpfull: Yes(14) No(0)
• @Sandy:
  why you have taken the weight of 5th box = 500 please explain
• 11 years agoHelpfull: Yes(5) No(1)
• weight of first box=200kg
  weight of 3rd box =((25/100)*200)=50+200=250
  weight of 2nd box=((20/100)*250)=50+250=300
  weight of 4th box=350
  weight of 5th box=500
  
  Avg weight of 1st 4 heaviest boxes=350
  Avg weight of 1st 4 lightest boxes=275
  
  Diff =(350-275)=75
• 11 years agoHelpfull: Yes(2) No(0)
• 75 is the answer
  
• 11 years agoHelpfull: Yes(1) No(0)
• Hear given that 1box is= 200.
  3rd box is 25% Higher than 1box,so 3rd box is (125/100)*200=250
  2nd box is 20%---------------- 3rd box,sob2bd box is (120/100)*250=300
  4th box=350
  4th box which weighs 350KG is 30% lighter than the 5th box,that means
  5th box weight Is 30% Less than 4th box,so
  5th box is 350*(100/(100-30))=500 Kg.so
  average of 4 highest weighted boxes=(500+350+300+250)/4=350
  average of 4 lightest boxes=(350+300+250+200)/4=275
  therefore difference=350-275=75
• 9 years agoHelpfull: Yes(1) No(0)
• weight of 1st box=200
  weight of 3rd box= 25% higher than of 1st box
  i.e = (125/100)*200 = 250
  weight of 2nd box= 20% higher than of 3rd box
  i.e =(120/100)*250 = 300
  
  given that
  weight of the 4th box = 350
  
  and weight of the 4th box is 30% lighter than 5th box
  
  i.e weight of the 4th box = 30% lighter than 5th box
  350 = (70/100)* 5th box
  5th box = 350(100/70) = 500
  
  average of 4 highest weighted boxes=(500+350+300+250)/4=350
  average of 4 lightest boxes=(350+300+250+200)/4=275
  therefore difference=350-275=75
  
• 9 years agoHelpfull: Yes(1) No(0)
• 75 is right answer
  weight of first box is 200 kg;
  weight of third box is 250 kg;
  weight of second box is 300 kg;
  weight of fourth box is 350 kg;
  weight of fifth box is 3/7*350=150 kg more then 350so total weight of fifth box is 500 kg;
  light weight average 1100/4=275;
  heavy weight average 1400/4=350;
  difference is 350-275=75;
  
  
• 11 years agoHelpfull: Yes(0) No(0)
• boxes a,b,c,d,e are 200,300,250,350,500 so avg of last 4(350)-avg of first 4(275) will be 75
• 11 years agoHelpfull: Yes(0) No(0)
• lucky u are always right............................
• 11 years agoHelpfull: Yes(0) No(0)
• weight of 5th box=(10/7)*350=500
  
  why 10/7 why not 7/10 pls wxplain
• 10 years agoHelpfull: Yes(0) No(1)
• 1st box=200, 2nd=300, 3rd=250,4th=350,5th=500. so avg of four heaviest=1400/4 and avg of four lightest box=1100/4. and the difference of these two is 75.
• 9 years agoHelpfull: Yes(0) No(0)