Question

My phone battery lasts for 20 hours when fully charged. The duration that the battery lasts is proportional to its percentage charge.
How long will the battery last if it is 30%, percent charged?​

Answer 1

Answer:

6 Hours

Step-by-step explanation:

100% = 20 hours

Means:-

50% = 10 hours

5%    = 1 hour

.*. 1% = 1/5 hours

Then,

30% = 1/5 x 30 = 6 hours