What is the greatest possible length which can be used to measure exactly the lengths 10 m 50 cm, 14 m 55 cm and 50 cm?  Choose one:
A) 20 cm  B) 24 cm  C) 30 cm  D) 10 cm  E) 5 cm
Required length = HCF of 1050 cm, 1455 cm, 50cm = 5 cm   Answer is 5 cm
<result>E</result>
What is the greatest possible length which can be used to measure exactly the lengths 10 m 50 cm, 14 m 55 cm and 50 cm?