TCS Company

radius of sphere is increased by 10%.what is the % increased by surface area?

Read Solution (Total 2)

ans is 21%.
take radius 100. then surface area will be 4*22/7*100*100.
after increase radius by 10% the radius become 100+10% of 100=110,then new surface area will be 4*22/7*110*110.
then increase in surface area percentage ((4*22/7)*110*110 -(4*22/7)*100*100)/(4*22/7-100*100)=0.21*100=21%.
12 years agoHelpfull: Yes(11) No(0)

suppose first sphere= 4*pi*100*100 (1)
after increase in radius = 4*pi*110*110 (2)
according (1)&(2)
ANS=21%
12 years agoHelpfull: Yes(2) No(0)

TCS Other Question

100 men & women dance with each other. Probability of a man cannot dance with more than two women.
A father and his son go out for a â€˜walk-and-runâ€™ every morning around a track formed by an equilateral triangle. The fatherâ€™s walking speed is 2 mph and his running speed is 5 mph. The sonâ€™s walking and running speeds are twice that of his father. Both start together from one apex of the triangle, the son going clockwise and the father anti-clockwise. Initially the father runs and the son walks for a certain period of time. Thereafter, as soon as the father starts walking, the son starts running. Both complete the course in 45 minutes. For how long does the father run? Where do the two cross each other?