Nereo and Azeneth start recording video at the same
time. Nereo's phone starts with 1,000 megabytes (MB)
of free space and uses 7 MB of space per second of
video.
Azeneth's phone has 1,255 MB of free space and uses
10 MB of space per second of video.
How much free
space will they have when they first
have the same amount of space left?
MB

Question

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Respuesta :

Parrain Parrain · Answer 1 · 2022-09-09T17:47:18+02:00

The amount of free space that both Nereor and Azeneth will have when the free space is the same is 405 mb

Assuming that the number of seconds is x, then the free space in Nereo's phone can be modelled as:

= 1,000 - 7x

The free space in Azeneth's phone would then be:
= 1,255 x 10x

The free space when the free spaces between them are equal is:
1,000 - 7x = 1,255 - 10x

-7x + 10x = 1,255 - 1,000

3x = 255

x = 85 seconds

The free space would be:

= 1,255 - 10 x 85

= 405 mb

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