#36.9
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- An engineer designs a lightweight frame for an electric motorcycle using a composite material that reduces weight by 18% compared to aluminum. If the aluminum version weighs 45 kg, what is the weight of the composite frame?
- Weight reduction: 18% of 45 = 0.18 × 45 = <<0.18*45=8.1>>8.1 kg
- Composite weight: 45 – 8.1 = <<45-8.1=36.9>>36.9 kg
- A historian analyzing Galileo’s correspondence notes that 40% of his letters were written in Latin, and the rest in Italian. If he wrote 350 letters total, how many were written in Italian?
- Letters in Latin: 40% of 350 = 0.4 × 350 = <<0.4*350=140>>140
- Italian letters: 350 – 140 = <<350-140=210>>210
