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28 how much time will it take two different fire

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28. How much time will it take two different fire extinguishers to shutdown a level 3 fire?(1) The first fire extinguisher can shut down a level 3 fire in 45 seconds.(2) The second fire extinguisher can shut down a level 3 fire in oneminute and 20 seconds.a)Statement (1) BY ITSELF is sufficient to answer the question, butstatement (2) by itself is not.b)Statement (2) BY ITSELF is sufficient to answer the question, butstatement (1) by itself is not.c)Statements (1) and (2) TAKEN TOGETHER are sufficient to answerthe question, even though NEITHER statement BY ITSELF is sufficient.d)Either statement BY ITSELF is sufficient to answer the question.e)Statements (1) and (2) TAKEN TOGETHER are NOT sufficient toanswer the question.The best answer is C.Statement (1) gives you the output of the first fire extinguisher, which is1/45 fires in a second.
Statement (2) gives you the output of the second fire extinguisher, whichis 1/110 fires in a second.Combine the two statements, we know the total output of the twoextinguishers and so we can easily calculate the time it would take themto shut down the fire.29. What is the average number of questions that Laura can write in threedays if on the first day she wrote 20 questions?(1) Every passing day the number of questions that Laura writes growsby 20%.(2) On the other two days, Laura wrote 53 questions.a)Statement (1) BY ITSELF is sufficient to answer the question, butstatement (2) by itself is not.b)Statement (2) BY ITSELF is sufficient to answer the question, butstatement (1) by itself is not.c)Statements (1) and (2) TAKEN TOGETHER are sufficient to answerthe question, even though NEITHER statement BY ITSELF is sufficient.d)Either statement BY ITSELF is sufficient to answer the question.e)Statements (1) and (2) TAKEN TOGETHER are NOT sufficient toanswer the question.The best answer is D.Laura writes questions over a 3 day period.In the first day Laura wrote 20 questions.Statement (1) tells us that on the second day she wrote (1.2 x 20 = 24)questions and on the third day she wrote (1.2 x 24). This statement issufficient in order to calculate the average.Statement (2) is also sufficient, it gives us the sum of questions that Laurawrote in the other 2 days and therefore the average can be easilycalculated.Each statement is sufficient on its own.
30. How many pictures exactly did Sammy develop on Saturday?(1) Sammy gave away 3 films for development.(2) There are approximately 36 pictures in one film.a)Statement (1) BY ITSELF is sufficient to answer the question, butstatement (2) by itself is not.b)Statement (2) BY ITSELF is sufficient to answer the question, butstatement (1) by itself is not.c)Statements (1) and (2) TAKEN TOGETHER are sufficient to answerthe question, even though NEITHER statement BY ITSELF is sufficient.

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Term
Fall
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Tags
Orders of magnitude, Mr Rusty

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