Quantitative Aptitude - Arithmetic Ability Questions

If 1/6 of x - 7/2 of 3/7 equals - 7/4, then the value of x is

A basket contains 300 mangoes . 75 mangoes were distributed among some students . Find the percentage of mangoes left in the basket

If x+1x2 = 3, then the value of x3+1x3 is:

The salary of a person is reduced by 20% . To restore the previous salary, his present salary is to be increased by

ABCD is a quadrilateral with AB = 9 cm, BC = 40 cm, CD = 28 cm, DA = 15 cm and angle ABC is a right –angel. 
What is the area of triangle ADC?

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?

If Tan θ = 7/24, then what is the value of Cosec θ?

α and β are the roots of quadratic equation. If α + β = 8 and α – β = 2√5, then which of the following equation will have roots α4 and β4?