Answer: 12ft, option D is correct
Explanation:
According to the yardstick,
if 3ft height = 6 ft base
Then x height = 24 ft base
We find x height.
To find x height, we cross multiply:
6x = 24 x 3
6x = 72
Divide both sides by 6
x = 72/6
x = 12
Therefore, height is 12ft.