self Maths Puzzle

19 28 39 51 67 84 103 __?

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self Other Question

3 small pumps and a large pump are filling a tank. Each of the three small pumps work at 2/3rd the rate of the large pump. If all 4 pumps work at the same time, they should fill the tank in what fraction of the time that it would have taken the large pump alone? The income of A, B and C are in the ratio 7 : 9 : 12 and their spending are in the ratio 8 : 9 : 15. If A saves 1/4th of the income then what is the ratio of the savings of A, B and C?