Average score of a class of 50 students, in an exam was 34. Average score of the students who had passed is 52 and the average score of students who had failed is 16. How many failed the exam

X's age 3 years ago was three times the present age of Y. At present, Z's age is twice the age of Y. Also Z is 12 years younger than X. What is the present age of Z

A trader sells an item to a retailer at 20% discount, but charges 10% on the discounted price, for delivery and packaging. The retailer sells it for INR 2046/- more, thereby earning a profit of 25%. At what price had the trader marked the item

A bag contains 3 red balls, 5 yellow balls and 7 pink balls. If one ball is drawn at random from the bag, what is the probability that it is either pink or red

The respective ratio of curved surface area and total surface area of a cylinder is 4:5. If the curved surface area of the cylinder is 1232 cm². What is the height ?(in cm)

8 4 6 15 ? 236.25