Find a volume of a seedless orange with radius 5cm. 523.60cm
1) suppose the peel of the orange is 0.5cm thick.What volume of the orange is eddible?
2)Express the edible part of the orange as a percent of the whole orange.Round your answer to the nearest percent.
Could u explain 1) & 2) solving?
Thanks.

Question

Find a volume of a seedless orange with radius 5cm.   523.60cm
1) suppose the peel of the orange is 0.5cm thick.What volume of the orange is eddible?
2)Express the edible part of the orange as a percent of the whole orange.Round your answer to the nearest percent.
Could u explain 1) & 2) solving?
Thanks.

anonymous · Answer

Is the orange a perfect sphere?

anonymous · Answer

pls help me

anonymous · Answer

yes

anonymous · Answer

lol ok, what's the volume of a sphere formula?

anonymous · Answer

v=4TTr3/2

anonymous · Answer

should look like this:

v = (4/3)PI(r)^3

anonymous · Answer

now for question 1) , plug in the radius of the orange for r... like this...

v = (4/3)PI(5)^3

anonymous · Answer

yes i did that

anonymous · Answer

ok, so if you want to know the portion that is edible, minus the portion that is not edible, namely 0.5... so now use a radius of 4.5cm and you'll have it...

anonymous · Answer

i did 5.0 - 0.5 and got 4.5

anonymous · Answer

cool, so you need to know the volume of the whole orange, and the volume of the edible part to find the percentage..  Please post the two volumes, and then we'll find the percentage that is edible..

anonymous · Answer

volume of the whole orange = 523.60          volume of the edible part = 380.51

anonymous · Answer

volume of edible part = 381.51 i mean

anonymous · Answer

523.6 is the whole and 381.7 is the part of the edible part...

anonymous · Answer

how did you get 380.70?? i know that is the right answer but i keep on getting 381.51

anonymous · Answer

I didn't get 380.70  I got 381.7

anyway, now we ask  "what percent of 523.6 is 381.7"

that equates to:

x(523.6) = 381.7

anonymous · Answer

wait but where is the x coming from?

anonymous · Answer

now dividing both sides gives 0.72899... and moving the decimal to percent..

72.899%

and rounding...

73% of the orange is for eats..  but personally I like the peel!!!  lol

anonymous · Answer

your a genius!!

anonymous · Answer

oh, the x is "what percent"   "what percent" is x

of (means times) 

is means (equals) 

what percent of bla1 = bla2

x times bla1 = bla2

x(bla1) = bla2

x = bla2/bla1

anonymous · Answer

ohhhh. hehe i personally like the of the orange. (:

anonymous · Answer

You'll get it.. learn to turn what you can say into algebra expressions.  It gets easy with practice just like speaking!  :)

anonymous · Answer

but hard at first..

anonymous · Answer

ok. well thanks.

anonymous · Answer

np