If each side of the cube is decreased by 29% then the surface area deceases by 49.59%
Explanation:
Length of the new cube=L-29% of L
=L-(29/100xL)
=L-29L/100
=(100L-29L)/100
=71L/100
=0.71L
Surface area with side of 0.71L=6(0.71L)^2
=6 x 0.5041L^2
=3.0246L^2
Decrease =6L^2-3.0246L^2
=2.9754L^2
Decrease Percentage=(2.9754L^2 x 2)/6L^2 %
=49.59%
Hope this helps you!
Question : If each side of a cube is decreased by 12%, then the percentage decrease in its surface area is:
Option 1: 25.66%
Option 2: 28.23%
Option 3: 22.56%
Option 4: 26.54%
Question : If each side of a rectangle is decreased by 11%, then its area will decrease by:
Option 1: 25%
Option 2: 21.13%
Option 3: 24.31%
Option 4: 20.79%
Question : If each side of a square is decreased by 17%, then by what percentage does its area decrease?
Option 2: 30.79%
Option 3: 31.11%
Option 4: 44.31%
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile