Quantitative Aptitude - Arithmetic Ability Questions

$32000 is invested at 10% for 2 years.Find the interest compounded Yearly

In a mixture of 35 litres, the ratio of milk and water is 4:1. If 7 litres of water is added to the mixture, the ratio of milk and water of the new mixture will be

If a merchant offers a discount of 30% on the list price, then he makes a loss of 16%. What % profit or % loss will he make if he sells at a discount of 20% of the list price?

If 1 shirt is offered free on purchase of 4 shirts, what is the effective discount (in %) on each shirt?

$$\begin{gathered} 3x2-14x+16=0 \\ 5y2-16y+12=0 \end{gathered}$$

A tower is broken at a point P above the ground. The top of the tower makes an angle 60° with the ground at Q. From another point R on the opposite sideof Q angle of elevation of point P is 30°. If QR = 180 m, then what is the total height (in metres) of the tower?

Excluding stoppages, the speed of a bus is 80 kmph and including stoppages, it is 60 kmph. For how many minutes does the bus stop per hour?

What least number must be added to 1039, so that the sum obtained is completely divisible by 29?