Quantitative Aptitude - Arithmetic Ability Questions

A milkman purchases the milk at Rs. x per litre and sells it at Rs. 2x per litre still he mixes 2 litres water with every 6 litres of pure milk. What is the profit percentage?

If the area of a semi-circle is 1925 sq.cm, then find its radius (in cm).

If (x- 7)2 + (y + 10)2 + (z - 6)2 = 0, then find the value of x + y+ z.

In an election only two candidates contested 20% of the voters did not vote and 120 votes were declared as invalid. The winner got 200 votes more than his opponent  thus he secured 41% votes of the total voters on the voter list. Percentage votes of the defeated candidate out of the total votes casted is:

Solve the following :

$$\begin{gathered} 24 - [25 - 26 - 27 - 28 - 29¯] = ? \\ \end{gathered}$$

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

(A) 48:134 (B) 40:110 (C) 18:48 (D) 30:80

Solve the following

78 ÷[-4 + -3 of 27 ÷ -18 ÷ -2]

A man walked diagonally across a square lot. Approximately, what was the percent saved by not walking along the edges?