The number of leaves that fall in a pool increases throughout the morning at a steady rate. At 9 a.m., 11 leaves fall in the pool. At 10 a.m., 16 leaves fall in the pool. How many leaves will fall in the pool at 12 p.m.?

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Quizplus · Accepted Answer

At 9 a.m., 11 leaves fall in the pool. At 10 a.m., 16 leaves fall in the pool. This means that every hour, the number of leaves that fall in the pool increases by 5 leaves. We know this because the problem tells us that the leaves are falling at a steady rate (leaves are falling at the same rate each hour).
 11ec0fb7_277f_a063_95f0_61c67f852e59_NR0002_00 Therefore, two hours later (at 12 p.m.) there will be ten more leaves (26 total) in the pool than at 10 a.m. You can use the method of quickly charting them, as shown above, or you can simply add 10 (5 per hour) to the amount that was in the pool at 10 a.m.
16 + 10 = 26 leaves

The Number of Leaves That Fall in a Pool Increases