Quantitative Aptitude - Arithmetic Ability Questions

If a4 + 1 = [a2 /b2 ] (4b2 – b4 – 1), then what is the value of a4 + b4?

Find the odd words/letter/number from the given alternatives:

The ratio of sand to gravel in a mixture is 7 : 8 while that between gravel and cement is 6 : 7. What is the ratio of sand to cement in the mixture?

A sum of money invested for 2 yrs and 9 months at the rate of 8% simple interest per annum became Rs.732 at the end of the period. What was the sum that was initially invested?

A sum of money (P) doubles in 10 years. How much would it be in 20 years at the same rate of simple interest?

In what time will Rs.4400 become Rs.4576 at 8% per annum interest compounded half-yearly?

In the following question, select the missing number from the given series.34, 69, 140, 283, ?, 1145

∆DEF is right angled at E. If m∠F = 45°, then find the value of (cosecD - 1/√3).