# There are 24 students in a science class. Mr. Sato will give each pair of students 3 magnets. So far, Mr. Sato has given 9 pairs of students their 3 magnets. How many more magnets does Mr. Sato need, so that each pair of students has exactly 3 magnet?

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5
Feb 16, 2017

Mr. Sato needs $9$ magnets.

#### Explanation:

AS there are $24$ students in the science class,

there are $\frac{24}{2} = 12$ pair of students.

Mr. Sato wants to give each pair of students $3$ magnets

Mr. Sato has already given $9$ pairs of students their $3$ magnets

Therefore number of pairs of students yet to be given magnets is $12 - 9 = 3$.

For them he needs $3 \times 3 = 9$ magnets.

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