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algebraic expressions

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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. homw many more magents does Mr. Sato need so that each pair of students has excatly 3 magnets.

  • algebraic expressions - ,

    Since they are given to pairs of students, you need 12*3 = 36 magnets in all. He has already given 9*3 = 27 magnets. What does that tell you?

  • algebraic expressions - ,

    24/2*3-9*3

  • algebraic expressions - ,

    I have no idea

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