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The problem asks about a mixture containing 1 liter (1000 ml) of liquid, with 20 ml of a toxic substance. The rest of the mixture is water.

Let’s solve it step by step:

### a) Beräkna andelen av det giftiga ämnet i blandningen.
This question asks for the percentage or fraction of the toxic substance in the total mixture.

The total volume of the mixture is 1000 ml, and the toxic substance accounts for 20 ml. To find the proportion of the toxic substance, we divide the volume of the toxic substance by the total volume:

\[
\text{Andel} = \frac{20}{1000} = 0.02
\]

Thus, the toxic substance constitutes **0.02** or **2%** of the total mixture.

### b) Beräkna förhållandet mellan det giftiga ämnet och vattnet.
This part asks for the ratio of the toxic substance to the water. Since the total volume is 1000 ml and the toxic substance is 20 ml, the volume of water is:

\[
\text{Volym vatten} = 1000 - 20 = 980 \, \text{ml}
\]

The ratio between the toxic substance and the water is:

\[
\text{Förhållande} = \frac{20}{980} = \frac{1}{49}
\]

Thus, the ratio of the toxic substance to the water is **1:49**.

Would you like any more details or have any further questions?

Here are 5 related questions for further practice:
1. If the toxic substance was 50 ml instead of 20 ml, what would the new percentage of the toxic substance in the mixture be?
2. What would the ratio between the toxic substance and water be if the total mixture was 500 ml instead of 1 liter?
3. How much toxic substance would need to be added to a 1000 ml mixture to make it 10% of the total mixture?
4. If the toxic substance and water were mixed in a 3:97 ratio, what would the amount of toxic substance be in 1 liter of the mixture?
5. How would the ratio change if the amount of water in the mixture doubled while keeping the toxic substance the same?

**Tip:** When calculating percentages or ratios in mixtures, always check the total volume and how much of each component is present to avoid errors.

En liter av en vätska innehåller 20 ml av ett giftigt ämne. Resten är vatten.
a) Beräkna andelen av det giftiga ämnet i blandningen.
b) Beräkna förhållandet mellan det giftiga ämnet och vattnet.

Learn how to calculate the percentage of a toxic substance in a 1-liter liquid mixture and determine the ratio between the toxic substance and water. This math problem involves percentages and ratios, suitable for students in Grades 6-8.

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