Question

От куска проволоки отрезали 40%,а потом еще 25% остатка.Сколько метров проволоки было в куске, если осталось еще 45 м?

Answer 1

Вся проволока 100%,значит
1)100-40=60% остаток без первого куска
2)60*0,25=15% отрезали во второй раз
3)100-40-15=45% осталось
4)45:0,45=100 м было
=================================

Answer 2

Calculating the Length of the Wire

To calculate the original length of the wire, we can use the following steps:

1. Calculate the First Reduction: - When 40% of the wire is cut, 60% of the wire remains. - Let's denote the original length of the wire as x. After the first reduction, 60% of x remains.

2. Calculate the Second Reduction: - After the first reduction, 25% of the remaining wire is cut, leaving 45 meters. - This means 75% of the remaining wire is left after the second reduction.

3. Set Up the Equation: - We can set up the equation: 75% of 60% of x equals 45 meters.

Solving for the Original Length

Let's solve for x using the equation:

0.75 * 0.60 * x = 45

Calculation

``` 0.75 * 0.60 * x = 45 0.45x = 45 x = 45 / 0.45 x = 100 ```

Answer

The original length of the wire was 100 meters.