By what percent is a 100-watt light bulb brighter than a 60-watt light bulb? (Round percent to the nearest tenth.
166
To determine the percent by which a 100-watt light bulb is brighter than a 60-watt light bulb, you can follow these steps:
Step 1: Calculate the difference in brightness between the two light bulbs.
- Subtract the wattage of the 60-watt bulb from the wattage of the 100-watt bulb: 100 - 60 = 40
Step 2: Determine the percentage increase in brightness.
- Divide the difference in brightness by the wattage of the 60-watt bulb: 40 ÷ 60 = 0.6667
Step 3: Convert the decimal to a percentage.
- Multiply the result by 100 to get the percentage: 0.6667 × 100 = 66.67
Step 4: Round the percentage to the nearest tenth.
- Round 66.67 to the nearest tenth: 66.7
Therefore, a 100-watt light bulb is approximately 66.7% brighter than a 60-watt light bulb.
To find the percentage difference in brightness between a 100-watt light bulb and a 60-watt light bulb, you can follow these steps:
1. Calculate the difference in wattage: 100 watts - 60 watts = 40 watts.
2. Divide the difference by the initial wattage (60 watts): 40 watts / 60 watts = 0.6667 (rounded to four decimal places).
3. Multiply the result by 100 to convert it to a percentage: 0.6667 * 100 ≈ 66.7%.
Therefore, a 100-watt light bulb is approximately 66.7% brighter than a 60-watt light bulb.