The term "a pair of ladders" is used because ladders typically come in sets or are used in conjunction with one another for tasks that require more than one person or for accessing different heights simultaneously. The word "pair" signifies two units that complement each other in function or design. Additionally, it's common in English to use "pair" for items that are often used together, such as shoes or gloves.
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you could say a pair of shoes is your day to day going out essential
yes
6.7 metres
ladders,ramps,and stairs
factor pair = 9600,1factor pair = 4800,2factor pair = 3200,3factor pair = 2400,4factor pair = 1920,5factor pair = 1600,6factor pair = 1200,8factor pair = 960,10factor pair = 800,12factor pair = 640,15factor pair = 600,16factor pair = 480,20factor pair = 400,24factor pair = 384,25factor pair = 320,30factor pair = 300,32factor pair = 240,40factor pair = 200,48factor pair = 192,50factor pair = 160,60factor pair = 150,64factor pair = 128,75factor pair = 120,80factor pair = 100,96