Questions asked by Sukimen

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• What is the colour of oxygen-poor blood?
  
• How can 10sqrt48 be simplified?
  
• A man is four times as old as his son. In five years he will be only three times as old as his son. What is the man's present age?
  
• How is the following solved? Is there reciprocation?
  
• How is the following simplified? Is cross multiplication used?
  
• How is question C solved?