Quantitative Aptitude - Arithmetic Ability Questions

If cosπ/4c - tanπ/4c = x, then x is

Convert binary 1101111 to decimal.

The largest 5 digit number exactly divisible by 84 is:

$$\begin{gathered} ∆ABC is similar to ∆PQR. If ratio of perimeters of ∆ABC and ∆PQR is 1:2 and \\ if PQ = 10 cm then what is the length of AB (in cm)? \end{gathered}$$

Product of 9b2, 3a2 and 4ab is

The ratio of three numbers is 5 : 6 : 8. If the sum of the three numbers is 380, then what is the smallest among the three numbers?

The maturity value of a certain sum after two years at 20% p.a. interest compounded annually is Rs. 14,400/-. Find the Principal amount.

What is the simplified value of sec4θ – sec2θ tan2θ?