 
<translate> Ọ chọrọ 12 / 6 = 2 rungs kwa ụkwụ. Ya mere, ọ chọrọ 50 * 2 = 100 steepụ. Nke ọ bụla n'ime ha dị mita iri na asatọ na iri na abụọ. Ya mere, ọ chọrọ 1.5 * 100 = 150 ụkwụ. Azịza ya bụ otu narị na iri ise. <eng> He needs 12 / 6 = 2 rungs per foot. So he needs 50 * 2 = 100 rungs. Each rung is 18 / 12 = 1.5 feet. So he needs 1.5 * 100 = 150 feet. Final answer: 150. 