Quantitative Aptitude - Arithmetic Ability Questions

A train travelling at 76 kmph crosses a 450 m long platform in 27 seconds. What is the length of the train?

If 192 pens cost is Rs.10, how many pens can be bought for Rs.5?

ABC is a triangle if sin (A+B2)=32 then the value of Sin c2 is

A cricketer, whose bowling average was 12.4 runs/wicket takes 5 wickets for 22 runs in a match, thereby decreases his average by 0.4. The number of wickets, taken by him before this match was:

If y=2-x1+x, then what is the value of 1y+1 + 2y+1y2-1 ?

A, B and C can finish a job working alone in 20, 30 and 60 days respectively. They all work together for 1 day, then A and B quit. How many days C working alone will take to finish the remaining part of the job?

Of the 3 numbers whose average is 40, the first is 1/3 rd the sum of other 2. What is the first number?

The mean score in a test of the 12 boys in a class was 16 while the overall mean of the 30 students in the class was 18.1. What was the mean score of the girls?