Question

mobile phone gets fully charged in 3 hours and, when kept idle, it drains
1
%
of the battery every 9 minutes. If the completely discharged mobile phone is charged for 2.25 hours and then unplugged and kept idle for 3 hours, what would be the remaining charge in the phone's battery?
​

Answer 1

Answer:

55%

Step-by-step explanation:

We can convert 3 hours into 180 minutes. We can also convert 2.25 hours into 135 minutes. We know that every 180 minutes the phone's charge reaches 100%. So, we can divide both by 10 to get

Every 18 minutes the phone charges up 10 more %.

We can divide this by 2 to get

Every 9 minutes the phone charges up 5 more %.

So, we can divide 135 by 9 to get 15. We multiply 5% by 15 to get

The completely discharged phone gains 75%.

We know keeping the phone idle for 9 minutes results in a 1% loss of charge. Again, we know 3 hours = 180 mins, we divide by 9 to get

-20% charge

Our answer is

75% - 20% = 55%

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Answer 2

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