5 /9 of a piece of metal has a mass of 7kg . what is the mass of 2/7 of the piece of metal?
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5/9 of a piece of metal has a mass 7kg
1 of a piece of metal has a mass =7/(5/9)
=63/5kg
hence 2/7 of a piece of metal has a mass
=63/5x2/7=18/5kg=3.6 kg
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