Question

El verano pasado $30\%$ de las aves que vivían en Town Lake eran gansos, $25\%$ eran cisnes, $10\%$ eran garzas, y $35\%$ eran patos. ¿Qué porcentaje de las aves que no eran cisnes eran gansos?

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?

$20$

$30$

$40$

$50$

$60$

Solución:

Las aves que no son cisnes constituyen $100\% - 25\% = 75\%$ del total, y los gansos son $30\%$ del total. La fracción pedida es $\dfrac{30}{75} = \dfrac{2}{5} = 40\%.$

Por lo tanto, la respuesta correcta es C.

The birds that are not swans make up $100\% - 25\% = 75\%$ of the total, and geese are $30\%$ of the total. The requested fraction is $\dfrac{30}{75} = \dfrac{2}{5} = 40\%.$

Thus, the correct answer is C.

2011 AMC 12A Problema 5

Solución:

El Problema 5 en otros años