Class : Class 9
d = 75% of old d .....
=> r = 75 %of old r.....
volume of sphere =4/3 *pi*r*r*r......
new= 4/3*pi*r*r*r*27/64.....
4/3*pi*r*r*r will cancel out.....
volume(new) =27/64 of old, decreased by 37/64, % =37/64*100=3700/64=37*25/16 = 57.81....
therefore answer is opt (D) .....hope you understood!!!!!
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Ans 2:
Class : Class 9
All fruits together = 100% OR x
Apples = 30% of x OR 30/100 of x
= 3/10 x
Oranges= 50% of (x - 3/10 x) OR 1/2 of (x - 3/10 x)
= 1/2 of 7/10 x
= 7/20 x
Pears = 20/20(All Fruits) - {6/20(Apples) + 7/20(Oranges)}
= 20/20 - 13/20
= 7/20
Therefore it is clear that 7/20 of all fruits is pears.
Hope this was helpful!