12. What should be added to 12÷15+2 to get 18÷9+25?
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Particles are smaller than 1 nm ,they are not visible to naked eye. 3. They do not scatter a beam of light. ... Solute particles cannot be separated by the process of filtration and sedimentation.
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12÷15+2= 2.8
18÷9+25= 27
2.8+x=27
x= 24.2
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