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zlopas [31]
3 years ago
9

A boy is three years than his sister. Three years ago he was two-thirds of his sister's age.What are their present ages?​

Mathematics
2 answers:
k0ka [10]3 years ago
7 0
Answer:Boy 9 years
Girl: 3 years
tangare [24]3 years ago
6 0

Answer: boy 9 years

Girl 3 years

Step-by-step explanation:

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Answer:

b; ∀x   P(x) ∨ ¬P(x)

Step-by-step explanation:

Suppose that we have a proposition p

Such that p can be true or false.

We can define the negation of p as:

¬p

Such that, if p is false, then ¬p is true

if p is true, then ¬p is false.

Also remember that a proposition like:

p ∨ q

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Then if we write:

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from this, we can conclude that the statement that is always true is:

b; ∀x   P(x) ∨ ¬P(x)

Where here we have:

For all the values of x,   P(x)  ∨ ¬P(x)

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