Una escalera con una altura total de 7'-7" (2.10 m - 17.80 cm) y una profundidad total de 9'-0" (2.70 m - 0 cm), con el marco del hueco de la escalera utilizado como última contrahuella, requiere _____ peldaños con una profundidad de huella de _____.

a. 11 contrahuellas; 9"
(22.80 cm) de ancho
b. 11 contrahuellas; 91
/2"
(24.10 cm) de ancho
c. 12 contrahuellas; 9"
(22.80 cm) de ancho
d. 12 contrahuellas; 91
/2"
(24.10 cm) de ancho


Answer: C

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