Quantitative Aptitude - Arithmetic Ability Questions

What is the third proportional to 9 and 15?

Simplify (b5x2a3z4)*(b3x2a4z5) / (a2b3z2)

Which of the following quadratic equations has real roots?

In ΔPQR, S and T are points on side PQ and PR respectively. ST is parallel to QR. If S divides PQ in the ratio 4:1 and length of QR is 15 cm,what is the length of ST?

In the following question, select the odd number group from the given alternatives.

In an alloy of German silver the ratio of copper to zinc was 17:7 while that of nickel to zinc was 4 :3. The ratio of copper to zinc to nickel in the alloy was

54% of 4000 is

Two donkeys are standing 400 meters apart. First donkey can run at a speed of 3 m/sec and the second can run at 2 m/sec. If two donkeys run towards each other after how much time (in sec) will they bump into each other?