Question

in a house 4 bulbs of 50W each are used for 5 hours a day and two 70 W fans each fan used 10 hours a day. calculate the unit consumed in a month of 30 days

Answer 1

As you said , if a house have 4bulbs which consume 50w per hour and used for 5 hours, then 4*50W=200W
And 2 fans of 70W*10 = 700W
Units consumed in 30 days
=(200*5+700*10)30/1000
=(1000+7000)30/1000
=8000*30/1000
=240000/1000
=240 KWH

Answer 2

Answer:

In a house, 4 bulbs of 50W each are used for 5 hours a day and two 70W each, fans are used 10 hours a day, the units consumed in a month of 30 days is 72KW

Explanation:

The number of bulbs  $=4$

power used by one tube light $=50W$

working time of tube light in a day $=5hrs$

total power consumption of tube light in a month $=30*5*50*4=30000W$

The number of fans $=2$

power used by one fan $=70W$

working time of a fan in a day $=10hrs$

total power consumption of the fan  $=30*10*70*2=42000W$

so the total power consumption of the home $=30000+42000=72000W=72KW$