```Question 610237
1 cm : 1.25 m

5*1 cm : 5*1.25 m

5 cm : 6.25 m

----------------------------------------

1 cm : 1.25 m

12*1 cm : 12*1.25 m

12 cm : 15 m

----------------------------------------

So the actual tank has a radius of 6.25 meters and is 15 meters tall

Now convert 15 meters to cm: 15*100 = 1500 cm

Then divide it by 12 cm:  1500/12 = 125

So the scale factor is 1/125

-------------------------------------------------------

Volume:

V = pi*r^2*h

V = pi*(6.25)^2*15

V = pi*39.0625*15

V = pi*585.9375

V = 585.9375pi

V = 585.9375(3.14159)

V = 1840.775390625

So the volume of the tank is approximately 1840.775390625 cubic meters

Surface area

SA = 2*pi*r^2 + 2pi*r*h

SA = 2*pi*(6.25)^2 + 2pi*6.25*15

SA = 2*pi*39.0625 + 2pi*6.25*15

SA = 78.125pi + 187.5pi

SA = 265.625pi

SA = 265.625(3.14159)

SA = 834.48484375

and the surface area is approximately 834.48484375 square meters.

<font color="red">--------------------------------------------------------------------------------------------------------------</font>
If you need more help, email me at <a href="mailto:jim_thompson5910@hotmail.com?Subject=I%20Need%20Algebra%20Help">jim_thompson5910@hotmail.com</a>

Also, please consider visiting my website: <a href="http://www.freewebs.com/jimthompson5910/home.html">http://www.freewebs.com/jimthompson5910/home.html</a> and making a donation. Thank you

Jim
<font color="red">--------------------------------------------------------------------------------------------------------------</font>```