Quantitative Aptitude - Arithmetic Ability Questions

Alarms from 3 different clocks sound after every 2, 4 and 6 hours, respectively. If the clocks are startedat the same 6 time, how many times do the alarms ring together in 3 days?

How many 3 ­digit numbers are completely divided by 4.

Find 2 consecutive natural numbers, sum of whose squares is 25.

How many natural numbers between 15 and 85 are divisible by 7?

A can do a work in 15 days and B in 20 days. If they work on it together for 6 days, then what fraction of work is left?

­ What is the equation of the line if its slope is 3/4 and y­intercept is 5?

The internal bisectors of ∠Q and ∠R of triangle PQR meet at O. If ∠P = 70°, then what is the measure of ∠QOR (in degrees)?

A cylinder of radius 4.5 cm and height 12 cm just fits in another cylinder completely with their axis perpendicular. What is the radius (in cm) of second cylinder?