What is the HCF of 20, 45 and 15

5

Step-by-step explanation:

Find the greatest common divisor:

gcd(20, 45, 15)

Find the divisors of each integer and select the largest element they have in common:

The divisors of 20 are:

1, 2, 4, 5, 10, 20

The divisors of 45 are:

1, 3, 5, 9, 15, 45

The divisors of 15 are:

1, 3, 5, 15

The largest number common to all divisor lists is 5:

divisors of 20: 1, 2, 4, 5, 10, 20

divisors of 45: 1, 3, 5, 9, 15, 45

divisors of 15: 1, 3, 5, 15

gcd(20, 45, 15) = 5

answer: 26

step-by-step explanation:

well, michelle wanted to measure the height of her school's flagpole she placed a mirror on the ground 48 feet from the flagpole then walk backwards until she was able to see the top of the pole in the mirror her eyes were 5 feet above the ground and she was 12 ft from the mirror using similar triangles find the height of the flagpole to the nearest tenth of a foot find the geometric mean of them pair of numbers. its easy math