Divide both sides by 5 to find \( y \):
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- Cross-multiply to solve for \( y \):
- 5y = 3 \times 15
- 5y = 45
- y = \frac{45}{5} = 9
- Therefore, the second vent releases \(\boxed{9}\) methane bubbles.
- A palynologist discovers that the ratio of pollen grains from conifer trees to those from deciduous trees in a sample is \( 7:4 \). If there are 28 conifer pollen grains, how many deciduous pollen grains are there?
