self Maths Puzzle

the total cost of 3 table and 5 chair is 1263 then what will be the cost of 6 table and 9chairs

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self Other Question

there is a cylindrical water tank which is opened at one side. the measurement are taken outside of the tank.diameter = 204cm.height = 102cm. thickness of tank at all sides is 2cm. how much water can be put into the tank at maximum? a^x + a^-x ????