Quantitative Aptitude - Arithmetic Ability Questions

If (1 + cosA)/(1 - cosA) = x, then x is

The ratio between the weights of gold and silver in an alloy is 17:3. If the weight of silver in the alloy is 2.7 gm, find the weight of gold in the alloy?

If in a two digit number, the digit at unit place is y and the digit at tens place is 5, then the number is

A student, by mistake, wrote 64 in place of 46 as a number at the time of finding the average of 10 given numbers & got the average as 50. The correct average of the numbers is

Average of 31 numbers is 19. If the average of first 8 numbers is 24, then what is the average of the remaining numbers?

What number, from the following should be deducted from 1184 to make it exactly divisible by 21?

The height of a tower is 50√3 m. The angle of elevation of a tower from a distance 50 m from its feet is

Two trains start moving from stations S and R. Both trains move towards each other at speeds of 35 km/hr and 42 km/hr respectively. When they meet each other, the second train has travelled 90 km more than the first. What is the distance (in km) between S and R?