The average score of boys in an examination in a school is 71 and that of the girls is 73. The average score of the school is 71.8. The ratio of the number of boys to that of the girls that appeared in the examination is:
A person can complete a journey in 21 hours. He covers the first one-third of the journey at the speed of 40 km/h and the remaining distance at the speed of 60 km/h. What is the total distance of his journey?
The height of Aaryan was 120 cm. After 1 year,his height increased by 15%, and in the next 1 year, his height increased by 16%. What will be the height (in cm) of Aaryan after the second years?
In a group of sports persons, 20 wrestlers have an average weight of 90 kg, while some athletes have an average weight of 68 kg. If the average weight of all sports persons is 78 kg, then the number of athletes is:
By selling a book for ₹480 at marked price, a shopkeeper gains 20%. During a clearance sale, the shopkeeper allows a discount of 10% on the marked price. What is his gain per cent during the sale?
