At a clearance sale, a shopkeeper gives 45% discount. If a customer paid ₹330 during the sale, then what is the marked price of that shirt?

The angle of elevation of a tower from a distance 50 m from its foot is 30°. The height of the tower is 

The product of two positive numbers is 11520 and their quotient is $$9\over5$$.Find the difference of two numbers?

Some students (only boys and girls) from different schools1 appeared for an Olympiad exam. 20% of the boys and 15% of the girls failed the exam. The number of boys who passed the exam was 70 more than that of the girls who passed the exam'. A total of 90 students failed. Find the number of students that appeared for the exam.

A Navy captain going away from a lighthouse at the speed of 4[(73) -1] m/s. He observes that it takes him 1 minute to change the angle of elevation of the top of the lighthouse from 60 ° to 45 °. What is the height (in meters) of the lighthouse? 

A person bought pens at 25 for a rupee and sold at 15 for a rupee. What is his profit percentage? 

The number, whose square is equal to the difference between the squares of 975 and 585, is: