First you would convert the 30 meters to centimeters. This gives you 3,000 centimeters.Now multiply 27 times 10 giving you the total length of all of the post. This will be 270 centimeters. Next you will multiply 3,000 centimeters by 26. (The reason we multiply by 26 and not 27 is because there are 27 post. We are only measuring the space between the post, not the number of post, so we subtract 1.) This will give you 78,000 centimeters.
Now add and your final answer is 78,270 centimeters.
26(3,000)+27(10)=78,270
78,000+270=78,270
78,270=78,270
Hope this helps :-)
