The average age of students in a class is 15.8 years. The average age of boys in the class is 16.4 years and that of the girls is 15.4 years. The ratio of the number of boys to the number of girls in the class is:

Which is known as Catholic acid? 

A trader had 16 quintals of wheat. He sold a part of it at 17% profit and the rest at 27% profit, so that he made a total profit of 21%. How much wheat did he sell at 27 % profit? 

In a certain code language, ‘+’ represents ‘x’, ‘ – ‘ represent ‘+’, ‘x’ represent ‘÷’ and ‘÷’ represents ‘-‘. What  is the answer to the following question
15 – 5  + 25 ÷ 10 =?

The current ages of Sonali and Monali are in the ratio 5:3. Five years from now, their ages will be in the ratio 10:7 Then, Monali’s current age is:

Which country has been ranked first in the Inclusive Internet Index 2021?

What is name of Indian mountaineer who entered 'Limca Book of Records' as the first Indian to climb the highest volcanoes of each of the 7 continents?

The smallest possible three - place decimal is: