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Reptile [31]
3 years ago
15

If Paula divides her pencils among three friends and herself, everyone gets the same number of pencils. If Paula divides her pen

cils among
five friends and herself, everyone will get the same number of pencils.
How many pencils could Paula have?
A 28
B. 30
C. 42
D. 48
Mathematics
1 answer:
belka [17]3 years ago
4 0
C.28 I guess if is not then sorry
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icang [17]

Any implication is logically equivalent to its contrapositive. In other words,

¬<em>p</em> ⇒ <em>q</em>   ⇔   ¬<em>q</em> ⇒ <em>p</em>

(¬ means the same thing as ~, "not")

To prove this: recall that

<em>p</em> ⇒ <em>q</em>   ⇔   ¬<em>p</em> ∨ <em>q</em>

This is because <em>p</em> ⇒ <em>q</em> is true if <em>p</em> is false, or both <em>p</em> and <em>q</em> are true, i.e.

<em>p</em> ⇒ <em>q</em>   ⇔   ¬<em>p</em> ∨ (<em>p</em> ∧ <em>q</em>)

Disjunction (∨ or "or") distributes over conjunction (∧ or "and"), so that

<em>p</em> ⇒ <em>q</em>   ⇔   (¬<em>p</em> ∨ <em>p</em>) ∧ (¬<em>p</em> ∨ <em>q</em>)

but ¬<em>p</em> ∨ <em>p</em> is always true, or a tautology, so we're just left with ¬<em>p</em> ∨ <em>q</em>.

Then

¬<em>p</em> ⇒ <em>q</em>   ⇔   <em>p</em> ∨ <em>q</em>

…   ⇔   <em>q</em> ∨ <em>p</em>

…   ⇔   ¬(¬<em>q</em>) ∨ <em>p</em>

…   ⇔   ¬<em>q</em> ⇒ <em>p</em>

4 0
3 years ago
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Greeley [361]

Answer:

5

Step-by-step explanation:

5 because it can only go into itself one time, 5 x 2 is 10 and 5 x 6 is 30

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Answer:

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Step-by-step explanation:

<u>Step 1</u>

The question says <em>"11 + Carlos's score (represented with a c)"</em>.

Hence: 11 + c

<u>Step 2</u>

The question says <em>"eight more than 11 + Carlos's score"</em>.

Hence: (11 + c) + 8

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