When glass products are made from recycled glass, the resulting products can be equal in quality to glass products ma...
DalaalFebruary 25, 2020
why not E?
Why couldn't answer choice E be correct? Doesn't the passage give us an example where the difference in quality between the grades of glass (that made out of recycled and that made out of quartz sand) not as great as the different grades of plastic (that original and the one recycled from it)? Isn't the existence of merely once scenario enough to conclude that this statement (answer choice E) could be correct?
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Thanks for the question! Take a careful look at the stimulus and see what’s being compared. We’re told that recycled glass can have up to the same quality as new glass. We’re also told that recycled plastic is always a lower grade of plastic than newer plastics. In other words, we’re comparing the quality of new glass vs old glass and new (or, at least, less recycled) plastic vs. recycled plastic. We are never told, however, about the difference in quality between different grades of glass in the stimulus. It could be the case that the grades of glass differ more than the grades of plastic, or vice versa; the stimulus is simply silent on this matter. Thus, (E) cannot be properly inferred from the stimulus.
Hope this helps! Feel free to ask any other questions that you might have.
DalaalFebruary 27, 2020
But isn't the stimulus comparing quality when it states that the recycled plastic is of a lower grade than the less-recycled. Also it is comparing quality when it determines that the recycled glass is the same quality as the new glass made of raw material? How do we not consider this a comparison of quality?
shunheMay 2, 2020
Hi @Dalaal,
So we are comparing the quality of different kinds of glasses and plastics. We know that, for example, plastic grade A is better than plastic grade B is better than plastic grade C. But note that nothing is said about different grades of glass, for one, even though we know that they can differ in quality as well. Now, let's say there are different grades of glass, Grade 1, grade 2, and grade 3.
What (E) tells us is that we can conclude from the statements above that the difference in quality between different grades of glass isn't as great as that between different grades of plastic.
For example, plastic grade A is better than B by 20 units, and B is better than C by 20 units. And glass grade 1 is better than 2 by 10 units, and 2 is better than 3 by 10 units. But we don't actually know the number of units that differentiate the different grades. In other words, we can't compare the difference in quality between different grades of glass and plastic based on what the stimulus tells us. And that's what makes (E) wrong.
