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67. A volume of X are having in a container of sphere , how many semi hemispheres of volume each will be required to transfer all the A into semi hemispheres?

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66. The ages of two people has the ratio of 6:5 and by adding the numbers we get 55 , after how many years the ratio would be 8:7?
70. A,B,C,D,E are there among A,B,C are boys and D, E are girls>>>>>>>> D is to the left of A and no girl sits at the middle and at the extremes . Then what is the order of their sittings.