MathDB

8

Part of 2011 AMC 10

Problems(2)

Percent of birds not swans are geese

Source: 2011 AMC a Problem 8

6/25/2011
Last summer 30%30\% of the birds living on Town Lake were geese, 25%25\% were swans, 10%10\% were herons, and 35%35\% were ducks. What percent of the birds that were not swans were geese?
<spanclass=′latex−bold′>(A)</span> 20<spanclass=′latex−bold′>(B)</span> 30<spanclass=′latex−bold′>(C)</span> 40<spanclass=′latex−bold′>(D)</span> 50<spanclass=′latex−bold′>(E)</span> 60 <span class='latex-bold'>(A)</span>\ 20 \qquad<span class='latex-bold'>(B)</span>\ 30 \qquad<span class='latex-bold'>(C)</span>\ 40\qquad<span class='latex-bold'>(D)</span>\ 50\qquad<span class='latex-bold'>(E)</span>\ 60
percentAMC
Is the beach crowded? Is it sunny?

Source: AMC 10 2011 b Problem 8

2/24/2011
At a certain beach if it is at least 80∘F80 ^\circ F and sunny, then the beach will be crowded. On June 10 the beach was not crowded. What can be said about the weather conditions on June 10? (A)(A) The temperature was cooler than 80∘F80 ^\circ F and it was not sunny. (B)(B) The temperature was cooler than 80∘F80 ^\circ F or it was not sunny. (C)(C) If the temperature was at least 80∘F80 ^\circ F, then it was sunny. (D)(D) If the temperature was cooler than 80∘F80 ^\circ F, then it was sunny. (E)(E) If the temperature was cooler than 80∘F80 ^\circ F, then it was not sunny.
AMC