Quantitative Aptitude - Arithmetic Ability Questions

If 3.5x = 0.07y, then find the result of [y-x / y+x]

What is the value of sec 4π/3?

When a number is increased by 26, it becomes 113% of itself. What is the number?

cosA/(1 -­ sin A) is equal to

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

Which of the following will yield a recurring decimal?

Find the value of x if 0.08x + 0.04y = 10 and 0.2(x-1) + 0.4y = 24.8

At a telephone exchange, three phones ring at intervals of 20 sec, 24 sec and 30 seconds. If they ring together at 11 : 25 a.m, when will they next ring together?