GMAT Question of the Day (Nov 10)

Math

Three cannons are firing at a target. If their individual probabilities to hit the target are 0.3, 0.4, and 0.5 respectively, what is the probability that none of the cannons will hit the target after one round of fire?

(A) 0.06
(B) 0.12
(C) 0.21
(D) 0.29
(E) 0.94

Verbal

From 2000 to 2010, beverage containers accounted for a steadily decreasing percentage of the total weight of domestic garbage in the Brazil. The increasingly widespread practice of recycling aluminum and plastic was responsible for most of this decline. However, although aluminum recycling was more widely practiced in this period than plastic recycling, it was found that the weight of plastic bottles in domestic garbage declined by a greater percentage than the weight of aluminum cans.

Which of the following, if true of the Brazil in the period 2000 to 2010, most helps to account for the finding?

A. Plastic bottles are significantly heavier than aluminum cans of comparable size.

B. Recycled aluminum cans were almost all beverage containers, but a significant fraction of the recycled plastic bottles had contained products other than beverages.

C. Manufacturers replaced many plastic bottles, but few aluminum cans, with polymer containers.

D. The total weight of plastic bottles purchased by domestics increased at a slightly faster rate than the total weight of aluminum cans.

E. In many areas, plastic bottles had to be sorted by color of the plastic before being recycled, whereas aluminum cans required no sorting.

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