Question

What is the greatest possible length which can be used to measure exactly the lengths 8 m, 4 m 20 cm and 12 m 20 cm?1
a. 30 cm
b. 25 cm
c. 20 cm
d. 10 cm

Answer 1

Answer: 8m = 800cm = 2*2*2*2*2*5*5

4 m 20 cm = 420 cm = 2*2*3*5*7

12m 20 cm = 1220= 2*2*5*61

So common factors in above three are 2*2*5 = 20cm

So, 20 cm is the answer

Step-by-step explanation:

Answer 2

Answer:

option c ( 20 cm )

greatest possible length which can be used to measure exactly the lengths 8 m, 4 m 20 cm and 12 m 20 cm is 20 cm

Step-by-step explanation:

8 m = 800 cm, 4 m 20 cm = 420 cm , 12 m 20 cm = 1220 cm

The answer is the HCF of 800,  420 , 1220

= 20 cm