Ratios can be a bit tricky to understand. They look like this:

1 : 5

What this means is ** for every** one

If you get confused by a ratio read it as __‘for every…’ ‘there are…’.__

If we are asked to find the ratio of girls to boys in a room where there is 1 girl and 5 boys. The ratio of girls to boys is 1 : 5.

**For every** 1 girl **there are** five boys.

The ratio of boys to girls in the same room is 5 : 1. **For every** 5 boys **there is** one girl.

If there were 4 boys and 2 girls in the room the ratio of boys to girls would be 4 : 2.

If the room filled up to 12 people but the ratio of boys to girls remained the same at 4 : 2 there would now be 8 boys and 4 girls.

Do you see why? The number of people in the room has doubled but the ratio stayed the same, so the number of boys and girls must also double.

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