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d1i1m1o1n [39]
3 years ago
11

Vera

Mathematics
2 answers:
Maurinko [17]3 years ago
6 0
2/5 of 100 would be 40%
1/9 an hour would be 1/9 x 40 % = 4.44% every hour
Total hours left would be 40% / 4.44%= 9.0009 = 9 hours
lidiya [134]3 years ago
4 0

Answer:

18/5 hours

Step-by-step explanation:

If Vera's phone has a battery life of 2/5 and it drains 1/9 every hour we can determine how much per hour her battery drains.

f the battery drains 1/9 per hour we know how much it drains per hour. To get the time is takes for 2/5 battery life to drain we can say 2/5 divided by 1/9.

=(2/5)/(1/9)=(2/5)*(9/1)

We have 5 and 1 at the bottom of the line  and 9 and 2 at the top of the line. We can simplify:

=18/5

It takes 18/5 hours for Vera's battery to last

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