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Last updated at Sept. 21, 2018 by Teachoo

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Ex 12.1, 7 Find the ratio of the following: (a) 30 minutes to 1.5 hours Here, We convert hours into minutes 1.5 hours = 1.5 ร 60 minutes = 15/10 ร 60 = 15 ร 6 = 90 minutes So, Ratio = (30 ๐๐๐๐ข๐ก๐๐ )/(90 ๐๐๐๐ข๐ก๐๐ ) = 30/90 Cancelling 0s = 3/9 = 1/3 โด Required ratio = 1 : 3 Ex 12.1, 7 Find the ratio of the following: (b) 40 cm to 1.5 m40 cm to 1.5 m Here, We convert m into cm 1.5 m = 1.5 ร 100 m = 15/10 ร 100 = 15 ร 10 = 150 cm So, Ratio = (40 ๐๐)/(150 ๐๐) = 40/150 Cancelling 0s = 4/15 โด Required ratio = 4 : 15 Ex 12.1, 7 Find the ratio of the following: (c) 55 paise to Rs 1 55 paise to Rs 1 Here, We convert Rs into paise Rs 1 = 1 ร 100 paise = 100 paise So, Ratio = (55 ๐๐๐๐ ๐)/(100 ๐๐๐๐ ๐) = 55/100 โด Required ratio is 11 : 20 Ex 12.1, 7 Find the ratio of the following: (d) 500 ml to 2 litresHere, We convert litre into ml 2 litres = 2 ร 1000 ml = 2000 ml So, Ratio = (500 ๐๐)/(2000 ๐๐) = 500/2000 Cancelling 0s = 5/20 = 1/4 โด Required ratio = 1 : 4

About the Author

Davneet Singh

Davneet Singh is a graduate from Indian Institute of Technology, Kanpur. He has been teaching from the past 9 years. He provides courses for Maths and Science at Teachoo.