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Mathematics as a specimen
Solution: If there are X plant specimens, there are 2/5x insect specimens.

x+2/5x=84

7/5x=84

x=84×5/7

x=60

Insect specimens =60×2/5=24 pieces.

Arithmetic solution;

Plant specimens =84÷( 1+2/5)=60 pieces,

Insect specimens =60×2/5=24 pieces.

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