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Numerical Ability
Age Problem
If the radius of a circle is increased by 20% then the area is increased by:
a) 44% b) 120% c) 144% d) 40% e) None of the above
Read Solution (Total 8)
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- Radius is increasd by 20% so new r=1.2r, New area=1.44pi(r^2) increase in area .. 0.44* 100 = 44%
- 13 years agoHelpfull: Yes(36) No(5)
- initially A=pi*r2
now R2=120/100r
then area=Pi*(120R/100)2
area=144R/100
that is area increases from 100 to 144=increase in area=44% - 13 years agoHelpfull: Yes(19) No(4)
- let say radius = 10
area = 314
new radius = 12
new area = 452.16
increment = (452.16-314)/314*100 = 44%
Ans - a) 44% - 13 years agoHelpfull: Yes(16) No(8)
- Shortcut trick for such type of question
a(a+200)/100 %
where a is Increased radius
after put the value of a
Answer is = 44 % - 7 years agoHelpfull: Yes(5) No(0)
- increased by 44%
- 9 years agoHelpfull: Yes(3) No(1)
- let initially the area is 100. as r increases by 20%,so the area increases 20% and 20% successively.
so we can use the formula a+b+ab/100.here a=b so 20+20+(20*20)/100=0.44=44% - 8 years agoHelpfull: Yes(1) No(0)
- increased by 44%
- 6 years agoHelpfull: Yes(0) No(0)
- percentage increase = X+Y+((XY)/100)
20+20+((20*20)/100) = 44% - 5 years agoHelpfull: Yes(0) No(0)
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