Question

What is the greatest length of a tape whose whole length can be used a number of times to measure the lengths 56 cm and 140 cm exactly?​

Answer 1

Step-by-step explanation:

Find the prime factors of 56 and 140:

56 = 2²×7

140 = 2²×5×7

Find the HCF:

HCF = 2²×7=28

Answer:The greatest length of the tape is 28 cm