by what percent os a 100- watt light bulb brighter than a 60 watt light bulb
To determine the percentage difference in brightness between a 100-watt light bulb and a 60-watt light bulb, we can calculate the ratio of the two wattages and express it as a percentage.
First, subtract the wattage of the 60-watt light bulb from the wattage of the 100-watt light bulb:
100 watts - 60 watts = 40 watts
Now, divide this difference by the wattage of the 60-watt light bulb:
40 watts / 60 watts = 0.67
Next, multiply this ratio by 100 to convert it to a percentage:
0.67 * 100 = 67%
Therefore, the 100-watt light bulb is approximately 67% brighter than the 60-watt light bulb.