Quantitative Aptitude - Arithmetic Ability Questions

Consider  the  multiplication  999  ×  abc  =  def132  in  decimal  notation, where  a,  b,  c,  d,  e  and  f  are digits. What are the values of a, b, c, d, e and f respectively?

What is the measure of an interior angle of a regular decagon?

What will come in the place of question mark (?) in the following question (You do not have to calculate the exact value)?

24.97% of 84.01 ÷ 6.995 = ?

What is the value of cos [(180 – θ)/2] cos [(180 – 9θ)/2] + sin [(180 – 3θ)/2] sin [(180 – 13θ)/2]?

A student multiplied a number by 3/10 instead of 10/3. What is the percentage error in the calculation?

If cosec ­4π/3 = x, then the value of x is

Of the 5 numbers whose average is 72, the first is 1/8 times the sum of other 4. The first number is _____.

In a school , 391 boys and 323 girls have been divided into the largest possible equal classes , so that each class of boys numbers the same as each class of girls . What is the number of classes ?