Quantitative Aptitude - Arithmetic Ability Questions

Expanded and simplification of (x + 3)(x - 1) will be equal to

Three balls ring at intervals of 15, 30 and 45minutes respectively. At what time will they ring together again, if they rang simultaneously at 8.00 AM?

Find the mean proportional between 2 and 98?

If cosA + cos2A = 1 then the value of sin2A + sin4A is

Of the 3 numbers whose average is 112, the first is 3/13 times the sum of other 2. The first number is _____.

The mean of the data 1, 1/2, 1/2, 3/4, 1/4, 2, 1/2, 1/4, 3/4 is

Find the total surface area (in cm2 ) of a hemisphere of diameter 42 cm.

Mother can bake 20 cakes in 4 hours, Mother and Dadima together can bake 60 cakes in 10 hours. How many cakes Dadima can bake in 30 hours?