Mary had 40 pencils that included blue and red. The ratio is .15 to .35. How many pencils did Mary have that are blue. This questions involves ratios.

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The ratio of blue pencils to red is .15 : .35

The whole set of pencils will be .15 + .35=0.5

To find the number of blue pencils, we solve the problem as indicated below:

=.15/.5 * 40=0.3 * 40=12 blue pencils.

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