- 1 water fills a tank at a rate of 150 litres during the first hour,350 litres during thre second hour, 550 litres during the third hour and so on. Find the number of hours necessary to fill a rectangular 16m x 9m x 9m,
- 2 A firm starts work with 110 employees for the 1st week. The number of the employees rises by 6% per week. How many persons will be employed in the 20th week if the present rate of expansion continues.
- 3 a contractor hires out machinery. in the first year of hiring out one piece of equipment the profit is $6000, but this diminishes by 5% in successive years. show that the annual profits form a geometric progression and find the total of all the profits for the first 5 years.
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