Question

Сгорела одна пятая свечи и еще 3 см.Высота свечи стала равна5см.Какая была свечка первоначально?

Answer 1

1. 3+5=8 (см)- 4/5 свечи
2. 8/4=2 (см) - 1/5 свечи
3. 2*5= 10 (см)
Ответ: 10 см

Answer 2

Problem Analysis

We are given that one-fifth of a candle has burned and the height of the candle has decreased by 3 cm. We need to determine the height of the candle initially.

Solution

Let's assume the initial height of the candle is h cm.

According to the given information, one-fifth of the candle has burned, which means four-fifths of the candle is remaining. The remaining height of the candle can be represented as 4h/5 cm.

We are also given that the height of the candle after burning is 5 cm. So, we can set up the following equation:

4h/5 - 3 = 5

To find the initial height of the candle, we can solve this equation.

Calculation

Let's solve the equation:

4h/5 - 3 = 5

Multiplying both sides of the equation by 5 to eliminate the fraction:

4h - 15 = 25

Adding 15 to both sides of the equation:

4h = 40

Dividing both sides of the equation by 4:

h = 10

Answer

The initial height of the candle was 10 cm.