To find Cubes in Vedic Maths

In a school, students must take at least one of these subjects: Maths, Physics or Chemistry. In a group of 50 students, 7 take all three subjects. 9 take Physics and Chemistry only, 8 take Maths and Physics only and 5 take Maths and Chemistry only. Of these 50 students, x take Maths only, x take Physics only and x + 3 take Chemistry only. Draw Venn diagram, find x, and hence find the number taking Maths.

In a class of 50 students, each student passed Maths or English. If 10 students passed both Maths and English, and 30 students passed Maths, the find the number of students who passed English.

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Which of the following is false as per Vedic theory?

In a sphere is inscribed in a cube, find the ratio of the volume of cube to the volume of the sphere.