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.

Choose the one which is different or odd from the following options?

In ΔPQR measure of angle Q is 90°. If cosP = 5/13, and PQ = 2.5cm, then what is the length (in cm) of side PR?

What is the value of 26 + 152?

At 8% simple interest per annum a sum of money becomes Rs. 300 in 2.5 years. What was the sum invested?

The radius of a hemisphere is 21 cm, what is its volume? (Take π = 22/7)

If tan (5x ­- 10°) = cot (5y + 20°), then the value of x + y is

The average revenues of 7 consecutive years of a company is Rs 83 lakhs. If the average of first 4 years is Rs 78 lakhs and that of last 4 years is Rs 90 lakhs, find the revenue for the 4th year.