Question

Question No: 5
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

Complete Question :- A 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 ?

A) 20%

B) 35%

C) 55%

D) 75%.

Solution :-

from given data,

→ In 3 hours phone charged = 100% (Full.)

→ in 1 hour phone charged = (100/3)%

→ in 2.25 hours(9/4) phone charged = (100/3) * (9/4) = 75% .

now, given that,

→ in 9 minutes battery drains = 1%

→ in 1 minute battery drains = (1/9)%

→ in 3 hours battery drains = (1/9) * (3 * 60) = 20% .

Therefore,

→ Remaining charge in the phone's battery = 75% - 20% = 55% (Option C) (Ans.)

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