CWEA Collections Grade 2 Journey/Analyst Practice Test 2025 - Free Practice Questions and Study Guide

To determine how many gallons of water a pipe holds when filled, we can start by calculating the total internal volume of the pipe with the grease coating factored in.

First, note the dimensions of the pipe: it's a 12-inch diameter pipe with a 1-inch coating of grease. The effective diameter of the inner pipe when filled with grease becomes 12 inches - 2 inches (1 inch on each side) = 10 inches.

Next, we need to calculate the volume of that inner section of the pipe. The formula for the volume \( V \) of a cylinder is:

\[

V = \pi r^2 h

\]

where \( r \) is the radius and \( h \) is the height (or length) of the cylinder.

1. The radius of the inner pipe with grease is \( 10 / 2 = 5 \) inches.

2. The height of the pipe is 300 feet. We need to convert this to inches: \( 300 \text{ feet} \times 12 \text{ inches/foot} = 3600 \text{ inches} \).

Now, we can plug these values into the formula:

\[

V = \pi (