A fan consumes 1 unit of electricity in 3 hours. Rahul has 2 fans which consumed 21 units this month. For how many hours did he use the fan this month?

31.5 hours

Step-by-step explanation:

Given that 1 unit of electricity is consumed in 3 hours by 1 fan, it means that 2 fans will consume 1 unit in

= 3/2 hours

= 1.5 hours

If 2 fans consume 1 unit in  1.5 hours then 21 units will be consumed in

= 21 * 1.5/1

= 31.5 hours

It means he used the fans for 31.5 hours

b

Step-by-step explanation:

i just took the test

to find the total number of combinations, multiply the quantity of each item by each other:

2 pairs of shoes x 3 pairs of shorts = 6 different combinations.

or