Others Maths Puzzle

In how many ways can 5 students and 5 teachers sit around a circular table such that no two teachers sit together?

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Others Other Question

x and 2x are three digit positive integers such that both x and 2x has only even digits. (For ex x = 200 and 2x = 400). How many values x can take ??

a) 64
b) 18
c) 16
d) 125
e) 100
In a college the ratio of boys to girls is 31:23 . When 75 more girls join the college this ratio becomes 124:107. How many more girls shd join the college to make the number of boys and girls equal ?
a.75 b.90 c.60 d.85 e.none