(8ª aula - 03/06/12)   7ª questão
Autor: PAPA ENEM | Publicado: 2012-06-11T13:46:00-07:00

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A parede do fundo é retangular
e as outras duas são trapézios retângulos congruentes. Cada lata da tinta usada
permite pintar 4m². Nessas condições, a quantidade de tinta necessária para
executar a tarefa é



a) 4 latas e meia.

b) 5 latas.

c) 5 latas mais 1/4 de lata.

d) 5 latas e meia.

e) 5 latas mais 3/4 de lata.



Comentários:

&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Dimensões das
paredes:



- parede do fundo: retangular
(2,5m x 4,0m), então a sua área = 10m²



- 2 paredes laterais:
trapézios: (3,0m + 2,5m) . 2,0m, então área = 11,0m²



- área total = 21 m² .&nbsp; Se com
uma lata pintam-se 4m², então:



1 lata --- 4m²

X latas --- 21m²



4x = 21

X = 21/4



X = 5,25 latas (5
latas e 1/4 de lata)



GABARITO: Letra C&nbsp;&nbsp; &nbsp;