Daily Math Challenge
A car engine is 25% efficient. If it uses 2000 joules of energy from fuel, how much useful work does it produce?
Answer
500 joules
📝 Step-by-Step Solution
1
Input energy: 2000 joules
2
Efficiency: 25%
3
Useful work: 2000 × 0.25 = 500 joules
💡 Helpful Hints
• Multiply input energy by efficiency percentage
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