SOLUTION: Okay, so I'm really struggling on this question, and I was wondering if someone could tell me what I'm doing wrong. Ralph is painting the barn below, including the sides and roo

Question 1181041: Okay, so I'm really struggling on this question, and I was wondering if someone could tell me what I'm doing wrong.
Ralph is painting the barn below, including the sides and roof. He wants to know how much paint to purchase.
The picture is in the link below:
https://founders.edtell.com/access/content/group/edtell_content_geometry/General%20Prisms.png

a. What is the total surface area that he is going to be painting? Round your answer to the nearest hundredth.
b. If one paint can covers 57 square feet, how many paint cans should he purchase?
c. If each paint can costs $23.50, how much will the paint cost?
d. Once the barn is finished being painted, there is going to be a party. Ralph wants to know how many people to invite to the party. What is the volume of the inside of the barn?

Here is the work I've done. I was told that it's incorrect. I looked back over it a couple of times, but I couldn't figure out where I went wrong. Can somebody please help me?
A.)
45x15x2=1350
20x15x2= 600
40x45x2= 3600
20x4= 80
1350+600+3600+80= 5630 ft
B.)
5630/57=98.77
98.77~99 cans
C.)
99x23.5=2326.5
2326.5= $2,326.50
D.)
45x20x15=19575
(1/2)x80x40x4=6400
19575+6400=25975 ft^3
Found 2 solutions by MathLover1, ikleyn:
Answer by MathLover1(20850) (Show Source): You can put this solution on YOUR website!

PART A
The barn is constructed by the following 2D shapes
Two triangles of height = and base =
Area = 2 * (1/2)*4*20) = 80}}}
Two rectangles of length = and width =

Two rectangles of length = and width =

One base of length = and width =

Two rectangles on each on one side of the roof. We have the length = but not the width. We can work out the width by using Pythagoras theorem

Area of the two rectangles on the roof part is =
Total area to paint = (to the nearest hundreth) ≈

PART C
one paint can covers square feet
->need cans of paint
Total cost of paint =
PART D
The barn is constructed by a cuboid and a rectangular prism
Volume of cuboid

V of triangular prism = Area of cross section × depth

Total volume
=

Answer by ikleyn(52785) (Show Source): You can put this solution on YOUR website!
.

Entering this link REQUIRES user ID and a password - - - THEREFORE, I was not able to enter,

so, I can not comment, answer and/or help you . . .

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