Question

The table shows the battery life of four different mobile phones:



Mobile Phone Battery Life


Phone

Battery Life (hours)


A 20
B 25
C 10
D 18


If 8.45% of the battery life of each mobile phone is used in a day by a typical user, for which mobile phone is 0.8 hour of battery life used in a day?
Phone A Phone B Phone C Phone D

Answer 1

You would need to find 8.45% of each battery life and see which one gives you 0.8 hours.
The base calculation for this would be:

A) 20 x (8.45/100) = 1.69

A shortcut: You know that the hours has to be smaller, because 1.69 hours is too big. The smallest number here is C, 10 hours. 8.45% of 10 hours = 0.845 which is the closest to 0.8 hours you can get with those choices.

Answer 2

Ok, so C would be the answer?

Answer 3

@mangotangochick