There are #24# students in the science class of Mr. Sato. He wants to give #3# magnets to each pair of students. He has already given #9# pairs of students their #3# magnets. How many more magnets does he need?

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Answer 1 · 2017-02-16T14:31:10

Mr. Sato needs #9# magnets.

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

there are #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 #3xx3=9# magnets.