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Last updated at Sept. 26, 2018 by Teachoo

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Ex 12.2, 3 Are the following statements true? (a) 40 persons : 200 persons = Rs 15 : Rs 75 Rs 15 : Rs 75 = (๐ ๐ 15)/(๐ ๐ 75) = 15/75 = 5/25 = 1/5 = 1 : 5 โด 40 persons : 200 persons = Rs 15 : Rs 75 Thus, True Ex 12.2, 3 Are the following statements true? (b) 7.5 litres : 15 litres = 5 kg : 10 kg7.5 litres : 15 litres = (7.5 ๐๐๐ก๐๐๐ )/(15 ๐๐๐ก๐๐๐ ) = 7.5/15 = (75/10)/15 = 75/10 ร 1/15 = 5/10 = 1 : 2 5 kg : 10 kg = (5 ๐๐)/(10 ๐๐) = 5/10 = 1/2 = 1 : 2 โด 7.5 litres : 15 litres = 5 kg : 10 kg Thus, True Ex 12.2, 3 Are the following statements true? (c) 99 kg : 45 kg = Rs 44 : Rs 2099 kg : 45 kg = (99 ๐๐)/(45 ๐๐) = 99/45 = 33/15 = 11/5 = 11 : 5 Rs 44 : Rs 20 = (๐ ๐ 44)/(๐ ๐ 20) = 44/20 = 22/10 = 11/5 = 11 : 5 โด 99 kg : 45 kg = Rs 44 : Rs 20 Thus, True Ex 12.2, 3 Are the following statements true? (d) 32 m : 64 m = 6 sec : 12 sec 6 sec : 12 sec = (6 ๐ ๐๐)/(12 ๐ ๐๐) = 6/12 = 1/2 = 1 : 2 โด 32 m : 64 m = 6 sec : 12 sec Thus, True Ex 12.2, 3 Are the following statements true? (e) 45 km : 60 km = 12 hours : 15 hours 45 km : 60 km = (45 ๐๐)/(60 ๐๐) = 45/60 = 15/20 = 3/4 = 3 : 4 12 hours : 15 hours = (12 โ๐๐ข๐๐ )/(15 โ๐๐ข๐๐ ) = 12/15 = 4/5 = 4 : 5 โด 45 km : 60 km โ 12 hours : 15 hours Thus, False

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.