Quantitative Aptitude - Arithmetic Ability Questions

If l + m + n = 9 and l2+m2+n2 = 31, then the value of lm + mn + nl will be

If a-1a=7,then a2+1a2=?

For x > 0, what is the minimum value of  x + x+22x?

Find out the odd word/letters/number/number pair from the given alternatives.

The ratio of milk and water in three samples is 1 : 3, 3 : 5 and 11 : 5. A mixture containing equal quantities of all three samples is made. What will be the ratio of milk and water in the new mixture?

If a:b = 5:8, find the value of (6a -­ 5b)/(a + 2b).

Findout the odd word/letters/number/number pair from the given alternatives.

From a point, 40 m apart from the foot of a tower, the angle of elevation of its top is 60°. The height of the tower is