Quantitative Aptitude - Arithmetic Ability Questions

In the following question, four groups of three numbers are given. In each group the second and third number are related to the first number by a Logic/Rule/Relation. Three are similar on basis of same Logic/Rule/Relation. Select the odd one out from the given alternatives.

If P : Q : R = 6 : 7 : 8 and R : S = 3 : 5, then what is P : S?

If 1+121+141+161+181-131-151-17 = 1+ 1x, then what is the value of x?

If 51.97 ­ (81.18 -­ x ) ­- 59.39 = 5.268, then value of x will be

In ΔABC, ∠B=90 deg and BC= √3 AB. Find the measurement of ∠A

Length of the sides of a triangle are a, b, c respectively. If a2 + b2 + c2 = ab +bc + ca then the triangle is

The diameter of a circle is equal to the side of the square. What is the area of the square if the area of the circle is 49π sq cm?

The average temperature for Monday, Tuesday, Wednesday and Thursday was 48° . The average temperature for Tuesday, Wednesday, Thursday and Friday was 52°, If the temperature on Monday was 42°, then the temperature on Friday was (in degrees)