human
A roll of 25 m wire weighs 5 kg. How much does a 75 m roll weigh?
assistant
How many times bigger is the 75 m roll than the 25 m roll? ** We know that the 75 m roll is three times bigger than the 25 m roll because 75 m / 25 m = <<75/25=3>>3
How much does the 75 m roll weigh? ** This means the 75 m roll weighs 3 times more than the 25 m roll: 5 kg * 3 = 15 Kg
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