Quantitative Aptitude - Arithmetic Ability Questions

Average of the height of 251 students of a school is 48. If the average of the height of the boys is 51 and the average of the height of the girls is 29, then what will be the ratio of the total height of boys and the total height of girls respectively?

PQ is a tangent to the circle at T. If TR = TS where R and S are points on the circle and ∠RST = 65°, the ∠PTS =

What is the angle between the two hands of a clock when the time shown by the clock is 8 p.m.?(in degrees)

If 3x - 8(2 - x) = -19, then the value of x is

If 7x - [3(2x - 3)]/2 = 1/2, then what is the value of x?

3 numbers whose average is 112, the first number is 1/6th the sum of other 2. What is the first number?

In a quadrilateral PQRS, l_S= 90°. A circle (o, r) touches the sides PQ, QR, RS and SP at A, B, C and D respectively. If QR= 38 cm, RS = 25 cm and QA = 27 cm, find 'r'.

A can do a piece of work in 10 days, B can do it in 12 days and C can do it in 15 days. In how many days will A, B and C finish it, working all together?