Question

Vera is using her phone .its battery life is down to 2/5 and it drains another 1/9 every hour . how many hours will her battery last?

Answer 1

Explanation:

To solve this you have to find like terms for the fractions:

2/5 => 18/45 (amount of power remaining)

1/9 ==> 5/45 (power consumption per hour)

If we divide 18 by 5 (the amount of power we have left divided by the amount of power consumption we use per hours), we find that the battery will last 3.6 more hours.

I hope this helps!

Answer 2

The battery last is for 5.4 hours or 5 hours and 24 minutes.

Explanation:

Given : Vera is using her phone. Its battery life is down to
`(2)/(5)` and it drains another
`(1)/(9)` every hour.

To find : How many hours will her battery last?

Solution :

Let the total battery be '1'.

Battery life is down to
`(2)/(5)`

Remaining battery life is
`1-(2)/(5)=(3)/(5)`

Battery drains at the rate of
`(1)/(9)` every hour.

Let 'x' be the number of hours battery will last.

So,
`(1)/(9)x=(3)/(5)`

`x=(3* 9)/(5)`

`x=(27)/(5)`

`x=5.4`

Therefore, The battery last is for 5.4 hours or 5 hours and 24 minutes.