Question

Число уменьшили на 20%.На сколько процентов надо увеличить полученное число, чтобы получить данное число?

Answer 1

100%-20%=80% 

80%+20%=100%

 

 

Answer 2

Calculating the Increase Needed After a 20% Decrease

To calculate the increase needed after a 20% decrease, we can use the following steps:

1. Calculate the Decreased Value: - If the original value is represented by x, then the decreased value is 0.8x (as 20% decrease means 80% of the original value).

2. Calculate the Increase Needed: - To find the increase needed to return to the original value, we need to solve the equation 0.8x + (increase) = x for (increase).

3. Solve for (increase): - The increase needed can be calculated as (increase) = x - 0.8x.

Let's calculate the increase needed.

Calculation

The increase needed after a 20% decrease can be calculated using the formula: increase = x - 0.8x

Substituting the value of x, we get: increase = x - 0.8x = 1x - 0.8x = 0.2x

So, the increase needed after a 20% decrease is 20% of the original value.

Conclusion

To return to the original value after a 20% decrease, the value needs to be increased by 20%.