Quantitative Aptitude - Arithmetic Ability Questions

There were 35 studentsina hostel.Ifthenumber of studentsbe increased by 7, the expenditure on food increases by Rs 42 per day while the average expenditure of studentsis reduced by Rs 1. What was the initial expenditure on food per day?

What will come in the place of question mark (?) in the following question (You do not have to calculate the exact value)?

24.97% of 84.01 ÷ 6.995 = ?

If the standard deviation of a population is 10, what would be the population variance?

Find the curved surface area (in cm²) of a hemisphere of diameter 28 cm

If 310 × 272 = 92 × 3n then the value of n is

A batsman makes a score of 81 runs in the 16th match and thus increases his average runs per match by 3. What is his average after the 16th match?

The average of 6 consecutive integers is 15/2. What is the average of last three integers?

In a circle of radius 8 cm, AB and AC are two chords such that AB = AC = 12 cm. What is the length of chord BC?