According to the last month electricity bill your total cons

According to the last month electricity bill your total consumption was of 815-kWh.How many 76-W light bulbs did you daily powered for an average use of 7 hours per day?

(express result with no decimals and omit units)

Solution

Total number of hours for month=30×7=210 hr

76w =0.076 kW

Then total kW hr= 0.076×210=15.96kwhr

Total number of bulbs required=815÷15.96=51