80% of a number is equal to the 4/5th of the other number. What is the ratio between the first number and the second number respectively?

Question: 80% of a number is equal to the 4/5th of the other number. What is the ratio between the first number and the second number respectively?

Solution:
Let the first number be x and the second number be y
According to the question,
80% of x = 4/5 of y
⇒ 80x/100 = 4y/5
⇒ 4x/5 = 4y/5
⇒ x = y
⇒ x : y =1 : 1