Pool Table Estimates
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math question?
For her science report, Stacey wants to estimate how often chlorine needs to be added to the community swimming pool. The lifeguard tells her the following facts:
The ideal level of chlorine is 3 parts per million (ppm).
For safety, the chlorine level must be at least 1 ppm.
Chlorine levels decrease at a rate of 20% per day.
Stacey uses a table to keep track of the approximate chlorine level in the pool. On day 1, the level starts at 3ppm, decreasing at the rate of 20% per day. To simplify calculations, Stacey rounds each loss amount to the nearest tenth. At the start of Day2 the chlorine level is 20% less than the 3 ppm level oof day 1. since 20% of 3=0.6 Stacey writes 0.6 on line 1. column b of the table. The pool lost 0.6 ppm of chlorine during day 1.
1. how does Stacey calculate how much chlorine is in the pool at the start of day 3?
2. To calculate the chlorine loss during day 3, Stacey should multiply______by____ round this product to the nearest tenth.
Since the pool lost .6 ppm of chlorine during day 1, at the start of day 2 is has 2.4 ppm.
Now, it will lose another 20% during day 2, so it loses: 2.4*.20=.48 which Stacey rounds to the nearest tenth so it is .5.
At the start of day 3 then the pool has 2.4-.5 ppm or 1.9 ppm.
To calculate chlorine loss during day three, Stacey should multiply 1.9 by .20
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