To find the ratio of plain blue bugs to the total number of bugs, we first need to determine the total number of bugs in the illustration.
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First group of shaded insects: There are 2 rows with 5 insects in each row, so: \[ 2 \text{ rows} \times 5 \text{ insects per row} = 10 \text{ shaded insects} \]
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Other group of insects: There are 2 additional insects that are shaded differently.
Now, we add the total number of insects: \[ 10 \text{ shaded insects} + 2 \text{ differently shaded insects} = 12 \text{ total insects} \]
Next, if we assume that the plain blue bugs are the remaining bugs after considering the shaded ones. Since no specific mention of plain blue bugs is given, we can conclude they are not included in the first groups.
Therefore, the ratio of plain blue bugs to total bugs will depend on how many plain blue bugs we assume there are.
Assuming there are no plain blue bugs visible, or they are not shown in the illustration, the ratio would be: \[ \text{Plain Blue Bugs} = 0 \ \text{Total Bugs} = 12 \]
Hence, the ratio would be: \[ \text{Ratio} = \frac{0}{12} = 0 \]
Please confirm if there are any plain blue bugs mentioned so we can get the exact ratio. Otherwise, under the assumption there are none, the final outcome is a ratio of \(0:12\), or simply \(0\).