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Composite Numbers

Mary collecte...

Question

Mary collected 30 seashells and numbered them from 1 to 30. After that, she removed all the composite-numbered seashells. How many seashells did she remove?

A

0

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B

19

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C

25

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D

7

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Solution

The correct option is B 19
Composite numbers are those numbers that have more than two factors.

There are 19 composite numbers between 1 and 30. These are: 4, 6, 8, 9, 10, 12, 14, 15, 16, 18, 20, 21, 22, 24, 25, 26, 27, 28, 30.

Thus, she removed 19 seashells from her collection.

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