Question

a fan consumes 1 unit of electricity in 3 hours Rahul has two fans which consumed 21 units this month for how many hours did he use the fans this month​

Answer 1

Answer:He used both fans for 63 hours.

It mean he used one fan for 31.5 hours.

Step-by-step explanation:

Time taken by two fans in one month= 21 multiplied 3

=63 hours

Time taken by one fan=31.5

Answer 2

Rahul use both fans for 63 hours each for 31.5 hours

Step-by-step explanation:

A fan consumes 1 unit of electricity in 3 hours

rahul used  two fans

asssuming that both the fans used equally

then both the fans consumed 21 units

fan consumes 1 unit in = 3 hours

fan consumes 21 units in = 21×3 hours = 63 hours

as, both the fans are run equally

then

time taken by the one fan in a month = $\frac{63}{2}$ = 31.5 hours

hence ,

Rahul use both fans for 63 hours each for 31.5 hours

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