Question

autumn used 0.675 of the battery life on her mp3 player. her brother borrowed it to play a game and used 0.2 of the total battery life. of her mp3 player shows the battery life that remains as a percentage, what does it showed after her brother is finished?

Answer 1

She starts out with the battery 100% full.
0.675 as a fraction is 67.5%
Subtract 67.5% from the initial amount.
100% - 67.5% = 32.5%
0.2 as a fraction is 20%
Subtract 20% from the amount left:
32.5% - 20% = 12.5%. She has 12.5% left.