In simplest form it would be 1/2 since 50 and 100 are divisible by 50.
The answer would be 19.25 ft because 1cm x 2.5 = 2.5 ft so you will have to do the same to 7.7 cm : 7.7cm x 2.5 = 19.25 ft.
The addition propertyof equality is the answer
What is the question so I can help there no tiles showe