Question

Battery was charged. when the charging began it was 23% full after 30 minutes of charging the battery was 89% full. how fast was the battery charged? How long did it take the battery to be funny charged?

Answer 1

The battery was charged at a rate of 2.2 percent per minute.It took the battery 35 minutes to be fully charged.

Answer 2

Answer:

The battery was charged at a rate of 2.2 % per minute.

It took 35 minutes to fully charge the battery

Step-by-step explanation:

Initial amount of charge = 23%

Charge after 30 minutes = 89%

Percentage of charge gained in 30 minutes = 89-23

                                                                         = 66 %

Charging speed of battery = $\frac{percentage\hspace{3}of\hspace{3}charge\hspace{3}gained}{time\hspace{3}taken\hspace{3}in\hspace{3}minutes}$

= $\frac{66}{30}$

= 2.2 % per minute

2.2% charge takes 1 minutes

1% charge takes $\frac{1}{2.2}$ minutes

Initially it was 23% charged so it needs 77% more charge to be fully charged.

So, 77% charge takes $\frac{1}{2.2}*77$ minutes    

                         =  $\frac{100}{2.2}$ minutes

                         = 35 minutes