If the cost price of 25 perts is equal to the selling price of 20 pens, then profit percent is

Train A moving at speed 72 kmph crosses train B moving at 3/4th speed of train A in the same direction in 1 min and 26 seconds. The length of train A is 25/18th of the length of train B. What is the difference between the lengths of two trains?

A and B earn in the ratio 2:1. They spend in the ratio 5:3 and save in the ratio 4:1. If the total monthly savings of both A and B are Rs.5,000, the monthly income of B is-

In a class, 60% speak Hindi and 70% speak English. If 28% of the students can’t speak any of the two languages, then what % of the students in the class can speak both the languages?

A salesman expects a gain of 13% on his cost price. If in a month his sale was ₹ 7,91,000, what was his profit ? 

The value of x for which the expressions 7x + 13 and 13x - 7 become equal is _____ .

Find the solution of 5x-7=12? 

The two vowels touch each other internally. Their radii are 2 cm and 3 cm. What will be the length of the largest chord of the bigger circle outside the inner circle?