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3 years ago

4. Elena noticed that, nine years ago, her cousin Katie was twice as old as Elena was then,

Mathematics

1 answer:

kakasveta [241]3 years ago

4 0

Answer:

k - 2e + 9 = 0

k - e - 4 = 0

Step-by-step explanation:

Given that Elena is currently e years old and Katie is k years old. Now, nine years ago, Katie was twice as old as Elena was.

So, k - 9 = 2(e - 9)

⇒ k - 2e + 9 = 0 .............. (1)

And, in four years, Elena will be as old as Katie is now.

So, k = e + 4

⇒ k - e - 4 = 0 ............... (2)

Therefore, the equations (1) and (2) matches the conditions. (Answer)

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Answer:
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Explanation:
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3 years ago

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Answer:

Number of messages sent by Chau = 15

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Step-by-step explanation:

Let number of messages sent by Chau = c

Number of messages sent by Kareem = 4 times as Chau

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