Quantitative Aptitude - Arithmetic Ability Questions

A tyre is sold at three successive discounts of 20%,30%, and 20%. What is the net discount (in percentage)

If a+b=5 and a­b=3, then the value of (a2+b2) is

A wholesaler had 200 dozens of mangoes. He sold some of these mangoes at 20% profit and the rest at 10% profit, so that he made 13% profit on selling all the mangoes. How many mangoes (in dozens) did he sell at 20% profit?

Priya's marks in History and Geography are in the ratio 5 : 7. If she got 14 marks more in Geography than in History, what are her History marks?

If Cosec θ = 17/8, then what is the value of Cos θ?

The value of(1(p-n)(n-q)+1(n-q)(q-p)+1(q-p)(p-n)) is

A carpenter can build a cupboard in 48 hours. After 12 hours he takes a break. What fraction of the cupboard is yet to be built?

If x +y = √3 and x - y = √2, then the value of 8xy (x2 + y2) is