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

Answer:

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

Step-by-step explanation:

Given : Vera is using her phone. Its battery life is down to $\frac{2}{5}$ and it drains another $\frac{1}{9}$ every hour.

To find : How many hours will her battery last?

Solution :

Let the total battery be '1'.

Battery life is down to $\frac{2}{5}$

Remaining battery life is $1-\frac{2}{5}=\frac{3}{5}$

Battery drains at the rate of $\frac{1}{9}$ every hour.

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

So, $\frac{1}{9}x=\frac{3}{5}$

$x=\frac{3\times 9}{5}$

$x=\frac{27}{5}$

$x=5.4$

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

Answer 2

Answer:

Step-by-step 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!