Barry is measuring the length of his pencils. The red pencil is 4.32 inches long, the blue pencil is 6.1 inches long, and the green pencil is 2.27 inches long.

What is the sum of the lengths of the pencils?

The sum of the lengths of the pencils is 4.32 + 6.1 + 2.27 = <<4.32+6.1+2.27=12.69>>12.69 inches. Answer: \boxed{12.69}.

Monica needs a piece of wood that is exactly 9.185 feet long for her project. She went to the store and bought one that was 10.5 feet long.

How much wood does Monica need to cut off?

Monica needs to cut off 10.5 - 9.185 = <<10.5-9.185=1.315>>1.315 feet of wood. Answer: \boxed{1.315}.

On Saturday, 12.4 inches of snow fell. Another 3.725 inches of snow fell on Sunday.

What was the total amount of snow that fell in the two days?

The total amount of snow that fell in the two days is 12.4 + 3.725 = <<12.4+3.725=16.125>>16.125 inches. Answer: \boxed{16.125}.

The weights of three samples from an experiment are 1.25050 g, 2.50055 g, and 2.74099 g.

What is a reasonable estimate for the total weight of all three samples?

A reasonable estimate for the total weight of all three samples is 1 + 2 + 2 = <<1+2+2=5>>5 grams. Answer: \boxed{5}.