saplings are to be planted 30 feet apart along one side of a straight lane 455 feet long. if the first sapling is to be planted at one end of the lane, how many saplings are needed?
(A)18 (B)16 (C)15又1/6 (D)15 (E)14
答案是(b)16顆
我不懂~~30feet1顆那不滿30feet也要算一顆嗎@@
我是覺得(D)15顆耶~~~~~誰能告訴我答案怎麼是(b) 感謝