## unplug 4 years ago 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.

1. 101Ryan101

Is the orange a perfect sphere?

2. unplug

pls help me

3. unplug

yes

4. 101Ryan101

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

5. unplug

v=4TTr3/2

6. 101Ryan101

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

7. 101Ryan101

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

8. unplug

yes i did that

9. 101Ryan101

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...

10. unplug

i did 5.0 - 0.5 and got 4.5

11. 101Ryan101

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..

12. unplug

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

13. unplug

volume of edible part = 381.51 i mean

14. 101Ryan101

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

15. unplug

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

16. 101Ryan101

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

17. unplug

wait but where is the x coming from?

18. 101Ryan101

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

19. unplug

20. 101Ryan101

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

21. unplug

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

22. 101Ryan101

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

23. 101Ryan101

but hard at first..

24. unplug

ok. well thanks.

25. 101Ryan101

np