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The image contains the following problem written in Swedish:

**Problem:**

1 liter of a liquid contains 20 ml of a toxic substance. The rest is water.

a) Calculate the proportion of the toxic substance in the mixture.

b) Calculate the ratio between the toxic substance and the water.

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Let's solve this step by step.

### Part a) Proportion of the toxic substance in the mixture

We know:
- The total volume is 1 liter = 1000 ml.
- The toxic substance is 20 ml.

The proportion of the toxic substance in the mixture is given by the formula:

\[
\text{Proportion of toxic substance} = \frac{\text{Volume of toxic substance}}{\text{Total volume of the mixture}} = \frac{20 \, \text{ml}}{1000 \, \text{ml}} = 0.02
\]

So, the toxic substance makes up **2%** of the total mixture.

### Part b) Ratio of the toxic substance to water

The amount of water in the mixture is:

\[
\text{Water volume} = 1000 \, \text{ml} - 20 \, \text{ml} = 980 \, \text{ml}
\]

The ratio of toxic substance to water is:

\[
\text{Ratio} = \frac{\text{Volume of toxic substance}}{\text{Volume of water}} = \frac{20 \, \text{ml}}{980 \, \text{ml}} = \frac{1}{49}
\]

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

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Would you like further details on any of these steps?

Here are 5 related questions to expand your understanding:

1. What would happen to the proportion if the amount of toxic substance were doubled?
2. How do we calculate the concentration of a substance in a mixture?
3. What is the inverse of the ratio of toxic substance to water?
4. If 2 liters of liquid contain 40 ml of toxic substance, does the ratio change?
5. How would you calculate the proportion of water in the mixture?

**Tip:** Always ensure units are consistent when solving problems involving ratios and proportions!

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

Learn how to calculate the proportion and ratio of a toxic substance in a liquid mixture. This problem involves finding the percentage of the toxic substance and its ratio to the water in the mixture. Suitable for students in Grades 5-7.

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