Question No. 15 The battery of a cell phone is enough for 9 hours when the phone is off and 1.5 hours when the phone is on. If the battery of my fully charged phone was discharged in 8 hours, then how long did I have it on? Options
Answers
Answer:
17 hours
Step-by-step explanation:
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Answer:
= 1.33333334 hours if ON.
Step-by-step explanation:
Given that ,
The battery of a cell phone is enough for 9 hours when the phone is off and 1.5 hours when the phone is on. If the battery of my fully charged phone was discharged in 8 hours,
To find how long did I have it on?
Now,
If battery of cell-phone is enough for 9 hours when it is OFF.
battery of cell-phone is enough for 1.5 hours when it is ON.
By using the unitary method,
9 hours battery of cell-phone if OFF = 1.5 hours if ON.
∵1 hours battery of cell-phone if OFF = (1.5/9) hours if ON.
∴8 hours battery of cell-phone if OFF = (1.5/9) × 8 hours if ON.
= 1.33333334 hours if ON.
Therefore, battery will remain charge till 1.33333334 hours when it is ON.
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