Quantitative Aptitude - Arithmetic Ability Questions

The HCF of 20, 28 and 48 is

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

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 three successive discounts of 20%, 30% and 40% are given, then what will be the net discount (in percentage)?

If  a+1/a = 3, then a3+1a3?

T is a point on the common tangents at P of two circles and if TA and TB are resectively the other tangents at A and B to the two circles drawn from the point T then

ΔPQR is right angled at Q. If cosP = 3/5, then what is the value of cosR ?

Rahi deposited Rs. 600 in a bank that promised 8% simple interest per annum. If Rahi kept the money with the bank for 5 years, she will earn an interest of