Quantitative Aptitude - Arithmetic Ability Questions

The average weight of 35 apples is 50 grams. If some apples of weight 40 grams each were removed, then average weight becomes 57.5 grams. How many apples of weight 40 grams were removed?

Ravi sold a smartphone for Rs. 30,000. Had he offered a discount of 10% on the selling price(SP), he would have earned a profit of 35%. What is the cost price?

Rs. 750 invested for 3 months gave an interest of Rs. 18. What was the simple rate of interest per annum?

The simple interest on Rs. 2000 for 2 years at Rs. 75 per thousand per annum will be

A does 60% of a work in 15 days. He then calls B, and they together finish the remaining work in 5 days. How long B alone would take to do the whole work?

The two roots of a quadratic equation are given as x = 1/7 and x = -1/8 . The equation can be written as:

A 12 m long wire is cut into two pieces, one of which is bent into a circle and the other into a square enclosing the circle. What is the radius of the circle?

What number should be added to each of the numbers 35, 115, 53 and 165, so that the resulting numbers are in continued proportion?