Question

A light bulb consumes 3600 watt-hours in 3 days and 18 hours. How many watt-hours does it consume per day?

Answer 1

`960` Watt

Explanation:

Power consumed by light bulb in
`3` days and
`18` hours =
`3600` Watt

number of hours in one day =
`24` hours

total number of hours in
`3` days and
`18` hours =
`3*24 + 18 = 90` hours

Power consumed by light bulb in
`1` hour =
`(3600)/(90) = 40` Watt

∴ Power consumed by light bulb in
`1` day (
`24` hours) =
`40*24 = 960` Watt

Answer 2

18 hours = 18/24 reduces to 3/4 of a day

3/4 = 0.75

so 3600/3.75 = 960 watts per day