Quantitative Aptitude - Arithmetic Ability Questions

A bag has Rs.51.25 in the form of 2-rupee, 50-paise and 25-paise coins in the ratio of 3:5:7. What is the total number of 50-paise coins?

The volume of a spherical balloon is increased by 700%. What is the percentage increase in its surface area?

The average temperature of Monday ,Tuesday , Wednesday and Thursday is 60°, The average for Tuesday, Wednesday, Thursday and Friday is 63°; If the ratio of temperature for Monday and Friday is 21 : 25, then what is the temperature of Friday ?

If x + y = 5, x3 + y3 = 35, then what is the positive difference between x and y?

If sum of the areas of the circumcircle and the incircle of an equilateral triangle is 770 cm2, then what is the area (in cm2) of the triangle?

If ABCDEF is a regular hexagon, then what is the value (in degrees) of ∠ADB?

If 3A = 7B = 13C, then A : B : C is equal to

The shopkeepers announce the same price of Rs. 700 for a sewing machine. The first offers successive discounts of 30% and 6% while the second offers successive discounts of 20% and 16%. The difference in their selling price is