 
<translate> Yana bukatar 12 / 6 = 2 matakai da kafar. Saboda haka yana bukatar 50 * 2 = 100 matakai. Kowane mataki yana da 18 / 12 = 1.5 feet. Don haka yana bukatar 1.5 * 100 = 150 feet. Amsar ƙarshe: 150. <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. 