Difference between revisions of "2011 AMC 10A Problems/Problem 8"
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Last summer 30% of the birds living on Town Lake were geese, 25% were swans, 10% were herons, and 35% were ducks. What percent of the birds that were not swans were geese? | Last summer 30% of the birds living on Town Lake were geese, 25% were swans, 10% were herons, and 35% were ducks. What percent of the birds that were not swans were geese? | ||
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| + | <math> \textbf{(A)}\ 20\qquad\textbf{(B)}\ 30\qquad\textbf{(C)}\ 40\qquad\textbf{(D)}\ 50\qquad\textbf{(E)}\ 60 </math> | ||
== Solution == | == Solution == | ||
75% of the total birds were not swans. Out of that 75%, there was <math>30\% \cdot 75\% = \boxed{40\%}</math> of the birds that were not swans that were geese. (C) | 75% of the total birds were not swans. Out of that 75%, there was <math>30\% \cdot 75\% = \boxed{40\%}</math> of the birds that were not swans that were geese. (C) | ||
Revision as of 10:48, 11 February 2011
Problem 8
Last summer 30% of the birds living on Town Lake were geese, 25% were swans, 10% were herons, and 35% were ducks. What percent of the birds that were not swans were geese?
Solution
75% of the total birds were not swans. Out of that 75%, there was 
of the birds that were not swans that were geese. (C)
