## Answers

So, for every 2 regular emails, there are 5 junk emails.

#### Explanation:

A ratio is a comparison between two quantities with the same unit.

It does not say many items there are altogether, only how many of one for how many of the other.

Ratio's are written

- in simplest form

- no fractions and no decimals

-no units (but the units are the same before being discarded)

She has 21 emails altogether - some junk and some regular

If there are 15 junk emails, there must be 6 regular emails

NOte: The order of how the numbers are written is important:

**regular emails : junk emails**

So, for every 2 regular emails, there are 5 junk emails.

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