Answer:
3.923 hours per day.
Explanation:
To calculate the number of hours Sharmila studies per day, we need to find out how much energy her electric bulb consumes per day and then divide the total energy consumption by the power of the bulb.
First, let's find out the energy consumed by the bulb per day:
Energy consumed per day = Power of the bulb * Number of hours the bulb is on per day
Given that the power of the bulb is 65 W, we need to find out how many hours the bulb is on per day. Let's denote this as h
So, the energy consumed per day by the bulb is
[tex]65 \text{W} \times h \: {hours}[/tex]
Next, we know that the sub-meter recorded 8.5 units of electricity in a month. Since there are typically 30 days in a month, we can calculate the energy consumed by the bulb per day using the total energy consumption in a month:
Energy consumed per day = Total energy consumption in a month / Number of days in a month
[tex] 8.5 {units} / 30 {days} = 65 \ \text{W} \times h \: {hours} [/tex]
Let's solve for (h)
[tex]h = \dfrac{8.5 \text{units} \times 30 \, \text{days}}{65\text{W}} [/tex]
[tex]h \approx 3.923 \: \text{hours}[/tex]
So, Sharmila studies for approximately 3.923 hours per day.
