 <translate> 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. <yor> Ó nílò 12 / 6 = 2 rungs fún ẹsẹ̀ kan. Nítorí náà, ó nílò 50 * 2 = 100 rungs. Ìlà ìpele kọ̀ọ̀kan jẹ́ 18 / 12 = ẹsẹ̀ bàtà méjì. Nítorí náà, ó nílò 1.5 * 100 = 150 ẹsẹ̀. Ìdáhùn tó péye ni pé: 150. 