A salesman offers a discount scheme of 'Buy 25 and get 5 free' on the purchase of notebooks in his shop. He professes that a notebook costs him ₹10, but in reality, it costs him ₹5. Find the difference between his profit percentage and scheme discount.

If the mean proportional of 18 and 98 is 2A + 6, the value of A is:

The distance from Chandigarh to Amritsar is covered in 4.5 hours at a speed of 50 km/hr. By how much should the speed (in km/hr) be increased to save 30 minutes of travel time?

The price (per litre) of petrol increases by 40%. By what percent should its consumption be reduced such that the expenditure on it increases by 19% only?

Evaluate: (-9) - (-60) ÷ (-15) + (-3) * 6

The average age of 40 students of a class is 12 years. If the age of the teacher is also included, the average age of the whole group becomes 13 years. The age (in years) of the teacher is:

The average age of 35 students in a group is 15 years. When the teacher's age is included, the average age of the group increases by 1.25 years. What is the teacher's age (in years)?

The simple interest on a principal amount (in ₹) is ₹524 for a period of 2 years at the rate of 5% per annum. The principal amount (in ₹) is:

The diagonals of a rhombus are 4 m and 6 m, respectively. Find its area (in m²).

Ajay invested some money in HDFC at 4% per annum rate of interest. What would be the corresponding simple interest (in ₹) if after 2 years, Ajay got ₹204 as compound interest, considering annual compounding?

If the income of Ravi is 24% more than that of Ram, then by what percentage is the income of Ram less than that of Ravi?

The greatest number, which divides 1477 and 671 to leave 0 and 6 respectively as remainders, is:

Pramod sold 154 chairs and had a gain equal to the selling price of 54 chairs. What is his profit percentage?

A shopkeeper bought an article for &520. At what price (in 7) should he sell the article to make 20% profit?

Two trains having lengths of 340 m and 360 m are running at speeds of 80 km/h and 90 km/h, respectively, in the same direction. The time taken (in minutes) by the faster train, coming from behind, to completely cross the other train is:

Krish has ₹1224 with him. He divided it amongst his sons Veer and Nitin and asked them to invest it at 4% rate of interest compounded annually. It was seen that Veer and Nitin got same amount after 12 and 13 years respectively. How much (in ₹) did Krish give to Nitin?

Evaluate: 32 ÷ 8 × 4-3 × 3

The greatest number, which divides 943 and 1957 to leave 7 and 1 respectively as remainders, is: