91.
The population of a town in three consecutive years are 5000, 7000 and 8400 respectively. The population of the town in the fourth consecutive year according to geometrical increase method is

92.
The suitable method of forecasting population for a young and rapidly increasing city is

97.
For the same solid content, if the quantity of sludge with moisture content of 98% is X, then the quantity of sludge with moisture content of 96% will be

99.
The alum, when added as a coagulant in water

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