book Maths Puzzle Numerical Ability

The book is very vague about this. Find the common difference of the sequence in which the first term is 5 and the 11th term is -10. Any help appreciated.
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book Other Question

Either perform the indicated operation or solve the equation, whichever is appropriate.


3/10 = 5/x
Please help!
2) The volume of a cylinder (think about the volume of a can) is given by V = πr2h where r is the radius of the cylinder and h is the height of the cylinder. Sup