Quantitative Aptitude - Arithmetic Ability Questions

Given: 6x + 2(6-x) > 2x -2 < 5x/2 - 3x/4; then x can take which of the following values?

If ax + by = 1 and bx + ay = 2aba2+b2 then x2+y2a2+b2 is equal to

If 2x- 3(4-2x) < 4x - 5 < 4x + 2x/3, then x can take which of the following values?

If  2x+14x = 1, then the value of  x2+164x2is

If the selling price of an article is doubled, then its loss percentage gets converted into the equal profit percentage. What is the loss percentage?

The least number, which when divided by 5, 6, 7 and 8 leaves a remainder 3 in each case, but when divided by 9 leaves no remainder, is:

If cos4θ-sin4θ=13 then the value of tan2θ is

If the time increases by 7 years, then simple interest increases by Rs 8400 on a sum of Rs 6000. What is the rate (in percentage) of interest per annum?