exam Maths Puzzle Numerical Ability

The number of milligrams of a certain substance per liter in samples of drinking water all tested within .05 of 40 milligrams per liter. Write this information as an inequality, us

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exam Other Question

The period of a simple pendulum is directly proportional to the square root of its length. If a pendulum has a length of 6 feet and a period of 2 seconds, to what length should it be shortened to achieve a 1 second period. What quantity of 60% acid solution must be mixed with 30% solution to produce 300mL of a 50% solution?