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1916. The present age of three persons are in proportions 4 : 7 : 9. Eight years ago, the sum of their ages was 56. Find their present ages (in years).
1918. Worker A takes 8 hours to do a job. Worker B takes 10 hours to do the same job. How long should it take both A and B, working together but independently, to do same job?
1920. In what ratio must a grocer mix two varieties of tea worth Tk. 60 a kg and Tk. 65 kg so that by selling the mixture at Tk. 68.20 a kg he may gain 10%.
1924. Running at the same constant rate, 6 identical machines can produce a total of 270 bottle per minutes. At this rate, how many bottle could 10 such machines produce in 4 minutes?
1925. A boatman goes 2 km against the current of the stream in 1 hour and goes 1 km along the current 10 minutes. How long will it take to go 5 km in stationary water?