express the first quantity as a percentage of the second :
a) 45 minutes, 2 hours
b)21/4 kg , 25 g
c)90 paise, Rupees 15
please explain step by step...
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Express the first quantity as a percentage of the second: a)48seconds,5mintues b)63cents,9dollars c)7mm,2cm d)24mintues,10hours
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