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The normal amount of lead in a certain water supply is 1.5 × 10⁻⁵ milligrams per liter. Today, when the water was tested, the lead level found was exactly 100 times as great as the normal level, still well below the Environmental Protection Agency’s action level. What concentration of lead, in milligrams per liter, was in the water tested today?

26 Jun

The normal amount of lead in a certain water supply is 1.5 × 10⁻⁵ milligrams per liter. Today, when the water was tested, the lead level found was exactly 100 times as great as the normal level, still well below the Environmental Protection Agency’s action level. What concentration of lead, in milligrams per liter, was in the water tested today?

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