27, 98, 36, 89, 45, ?

If the mean of numbers 27, 31, 89, 107, 156, is 82, then the mean of 130, 126, 68, 50, 1 is

If the mean of numbers 27, 31, 89, 107, 156, is 82, then the mean of 130, 126, 68, 50, 1 is

If 58 xx 74 = 27, 36 xx 28 = 19, 65 xx 86 = 33, then 29 xx 98 = ?

Evaluate the determinant |[27, 2, 3],[ 45, 5, 5],[ 36, 9, 4]|

The sequence 9, 18, 27, 36, 45, 54,….. consists of successive mutiple of 9. This sequence is then altered by multiplying every other term by -1, starting with the first term, to prduce the new sequence -9, 18, -27,36,-45, 54,…….. If the sum of the first n terms of this new sequence is 180, determine n.

17, 19, 22, 27, 34, 45, ….

If the mean of numbers 27, 31, 89, 107, 156 is 82, then the mean of 130, 126, 68, 50, 1 is :

Which number will replace the question mark (?) in the following series? 89, 90, 82, 109, 45, ?