Quantitative Aptitude - Arithmetic Ability Questions

The ratio of the number of boys and girls in a school is 3:2. If 20% of the boys and 25% of the girls are scholarship holders, the percentage of the school students who are not scholarship holders is

What percentage of 1 day is 18 minutes?

The arithmetic mean of the marks scored by students of a class is 58. 20% of them secured a mean score of 60. The mean score of another 30% of the students was 40. The mean score of the remaining students is

ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right –angel. 
What is the area of triangle ADC?

Find the curved surface area (in cm2) of a right circular cylinder of diameter 28 cm and height 12 cm.

If the diameter of a hemisphere is 21 cm, then what is the volume (in cub.cm) of hemisphere?

Two smaller circles touch a large circle internally and pass through the center O of the larger circle. If the diameter of the bigger circle is 28 cm, thenwhat is the area of the bigger circle which is not enclosed by the two smaller circles (in sq.cm)?

If x4+1x4=119,then the value of x-1x is