A cuboidal ice-cream bar have a length, breadth and thickness of 3 cm,5 cm and 2 cm respectively. Suppose both length and breadth decrease by the same percentage and the thickness remains the same. As a result, volume is reduced by 19%. What is the now breath?

• ans. 4.5 cm
• 10 years agoHelpfull: Yes(20) No(1)
• ans:4.7
  l*b*w=30
  19% of it is 5.7
  30-5.7=24.3
  new volume=(3-x)*(5-x)*(2)=24.3
  x=0.3
  new b=5-0.3=4.7
• 10 years agoHelpfull: Yes(18) No(22)
• let x be percentage of decrease of length
  [3-((x/100)*3)]*[5-((x/100)*5)]*2=[30-((19/100)*30)]
  or x^2-200x=1900=0
  therefore x=10,19
  checking we get x=10
  therefore breadth=[5-((10/100)*5)]=5-.5=4.5
• 9 years agoHelpfull: Yes(7) No(0)
• answer is 4.5.
  if breadth is decreased by 10% then volume is reduced to 19%.
• 10 years agoHelpfull: Yes(5) No(0)
• (L-Lx/100*b-bx/100*t)/Lbt=81/100
  (1-x/100)(1-x/100)=81/100
  (1-x/100)^2=(9/10)^2
  (1-x/100)^2= (1-1/10)^2
  x=1%
  1%0f 5
• 9 years agoHelpfull: Yes(1) No(1)
• answer is 4.7
  when the volume is reduced by 19%
• 10 years agoHelpfull: Yes(0) No(4)