Will give northlake high school has two lunch periods.

A greater percentage of second-lunch students (39%) eat outside.

Step-by-step explanation:

The proportion of students who eat first lunch is 0.54.  Out of those, 0.19 of them eat outside; this is 0.19/0.54 ≈ 0.35.

The proportion of students who eat second lunch is 0.46.  Out of those, 0.18 of them eat outside; this is 0.18/0.46 ≈ 0.39.

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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