Questions asked by Slytherin For Life

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• I came across this sum in the Unitary Method With Fractions exercise in my Math Textbook. What am I supposed to do here?
  
• A triangle has a perimeter 13 m. The two shorter sides have integer lengths equal to (x) and (x+1). What could be lengths of each of the 3 sides of the triangle?
  
• What does caliginous mean? Can I use it to say that it was a dark time in the metaphorical sense?