The lengths of four pencils are measured using a large scale. Which of them is longest if head and tip of the pencil is at:

Q. While measuring the length of a pencil, the reading of the scale at one end is 25 cm and at the other end is 35.5 cm. Find the exact length of the pencil using these readings.

Q. While measuring the length of a sharpened pencil, reading of the scale at one end is $2.0$ cm and at the other end is $12.1$cm. What is the length of the pencil

Q. Alex, Raj and Rohan measured the length of a pencil. They all used different units to express it. ​ Which of them measured the length correctly?​

Q. Ramesh had 20 pencils, Sheelu had 50 pencils and Jamaal had 80 pencils. After 4 months, Ramesh used tip 10 pencils, Sheelu used up 25 pencils and Jamaal used up 40 pencils. What fraction did each use up? Check if each has used up an equal fraction of her/ his pencils?

Q. Which measuring tool is used to measure the length of the pencil? What is the length?