Question

When a phone is on but not in use, the battery lasts 24 hours. When it is in constant use, the battery lasts 3 hours. If Nicole leaves the phone on for 9 hours, but only uses it for 60 minutes during this time, how many hours of battery are left after she uses it if she doesn’t use it anymore?

HELP

Answer 1

10 hours

Explanation:

Amount used:

1 hour of use would be

1/3 of 24 = 6 hours used of the total

8/24 of 24 would be 8 hours used of the total

14 total hours would be used out of a 24 hour totals, so that leaves 10 hours of battery use left.

I am not feeling real confident about this.

Answer 2

• 8 hours battery life left in idle use

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24 hours of idle use time is equivalent to 3 hours of active use.

If it was in use for 1 hour, it is equivalent to:

• 24/3 = 8 hours of idle time

Since it is included in the 9 hours, it is equivalent to:

• 9 - 1 + 8 = 16 hours

Battery life left:

• 24 - 16 = 8 hours