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The radius of a spherical ballon, of 30units , increases at the rate of 2units per second. then it's curved surface area increase by?

the answer is given as 480pie sq units/sec.

but for spheres
for r=30, CSA= 3600pie sq units.
after 1sec,
for r=32, CSA = 4096pie sq units.
so, change in CSA = 496pie sq units/sec.
why is this wrong?

as there are already 3 free mocks , if I take pack of mocks i.e 15 what I'll be expecting 3+12 or 3free+15 paid mocks???

Study the following information to answer the given questions: A*B means A is not greater than B A%B means A is not greater than or equal to B A&B means A is not smaller than B A#B means A is not smaller than or equal to B A@B means A is not greater than or smaller than B Statements: Y*T&V@X*J%M#P Conclusions: I. P % T II.M & X Only I is follow Only II is follow Either I or II follow Neither I nor II follow Both I and II are follow

hi

When they work alone, B needs 25% more time to finish a job than A does. They two finish the job in 13 days in the following manner: A works alone till half the job is done, then A and B work together for four days, and finally B works alone to complete the remaining 5% of the job. In how many days can B alone finish the entire job?

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Hello Team, When will be the result of DashCAT-3 declared?

From a regular hexagon ABCDEF with side a,A circular arc ABF is removed with A as a center and AB as radius.What is the perimeter of the remaining portion?

two different discountsv

A can do a piece of work in 24 days, B in 52 days
and C in 64 days. All begin to do it together but A
leaves after 6 days and C leaves 6 days before the
completion of the work. How many days did the
work last?