Question

Первое число составляет 80% второго. Сколько процентов первого числа составляет второе число?

Answer 1

Пусть a - второе число, тогда 0.8a - первое.
Составим пропорцию:
a - x%
0.8a - 100%
x=(a*100%)/0.8a=125%

Answer 2

Calculating the Percentage of the First Number in Relation to the Second Number

To calculate the percentage of the first number in relation to the second number, we can use the formula:

Percentage = (First Number / Second Number) * 100

Given that the first number is 80% of the second number, we can express this relationship as:

First Number = 0.8 * Second Number

Substituting this into the percentage formula, we get:

Percentage = (0.8 * Second Number / Second Number) * 100

Simplifying this, we find:

Percentage = 0.8 * 100 = 80%

So, the percentage of the first number in relation to the second number is 80%.