Quantitative Aptitude - Arithmetic Ability Questions

The arithmetic mean of the marks scored by students of a class is 58. 20% of them secured a mean score of 60. The mean score of another 30% of the students was 40. The mean score of the remaining students is

What is the value of 2 - 2z + z22 + 2z - z2, when z+2z = 2 ?

What is the area (in sq cm) of a rectangle if its diagonal is 26 cm and one of its sides is 10 cm?

If a sum of money doubles itself in 8 yrs, then the interest rate in percentage is ?

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?

Select the odd word/letters/number/number pair from the given alternatives.

If a + b = 1, then a4 + b4 - a3 - b3 - 2a2b2 + ab is equal to

129 meter from the foot of a cliff on level of ground, the angle of elevation of the top of a cliff is 30°. The height of this cliff is