Write down to what equals whole if: one fifth is equal 7, 3 of the fifth is equal 30, four ninth are equal 36, seven eighth are equal to 49

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1/5*x=7 x=7:1/5 x=35 3/5*x=30 x=30:3/5 x=50 4/9*x=36 x=36:4/9 x=81 7/8*x=49 x=49:7/8 x=56 to what is equal the one fourth part of meter =100sm*1/4=25sm; what the one fifth part centime =10mm*1/5=2mm is equal to; what the one twelfth part of hour =60min*1/12=5min is equal to; what the one fifteenth part of hour =60min*1/15=4min is equal to
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