The average age of a husband and his wife was 27 years when the child was born, the average age of the husband, the wife and new-born child is 21 years now. The present age of the child is:

Directions: The following pie chart show proportion of population of seven villages in 2009. Stud the pie chart and answer question that follows:

If the below poverty line population of the village 'X' is 12160, then the population of village 'S' is 

A trader allows a trade discount of 20% and a cash discount of on the marked price of the goods and gets a net gain of 20% of the cost. By how much above the cost should the goods be marked for the sale? 

The radius of a wire is decreased to one third. If volume remains the same, length will increase by :

4% of the selling price of an article is equal to 5% of its cost price. Again 20% of the selling price is Rs. 120 more than 22% of its cost price. The ratio of cost price & selling price is 

The diameters of two cylinders are in the ratio 3:2 and their volumes are equal. The ratio of their heights is

The HCF of x⁸ – 1 and x⁴ + 2x³ – 2x – 1 is :

The base and altitude of a right angled triangle are 12 cm and 5 cm respectively. The perpendicular distance of its hypotenuse from the opposite vertex is