Quantitative Aptitude - Arithmetic Ability Questions

The average marks of 45 students is shown as 65. It includes a wrong entry of 84 marks instead of 48 marks. The correct average is:

wooden bowl is in shape of a hollow hemisphere of internal radius 9 cm and thickness 1 cm. Find the total surface area of the bowl?

Raja and Kundan together can build a wall in 20 days, Kundan and Mahesh build the same wall in 30 days and Mahesh and Raja can build the same wall in 24 days. In how many days can all the three complete the same wall while working together?

Seven years ago, the age of Sahil was equal to the present age of Nihal. Sum of Sahil's age 5 year ago and Nihal's age 6 years later is 58 years. If Ruchi is 4 years elder to Sahil, then what will be Ruchi's age (in years) after 10 years?

If a + a2 + a3 – 1 = 0, then what is the value ofa3 + (1/a)?

If (X/4) = (Y/5) = (Z/9), then what is X : Y : Z?

If x = 93 , y = 93 , z = 94 then the value of x2 - y2 + 10xz + 10yz is

If the number 583_437 is completely divisible by 9, then the smallest whole number in the place of the blank digit will be