The average age of 30 students is 20 years and average age of 20 other students is 30 years. The average age of total number of students is :
If the ratio of areas of two circles is 4:9, then the ratio of their circumference will be:
The radius of a circle is increased by 10%. the percentage increase of its area is:
A fan is listed at INR 150/- with a discount of 20%. What additional discount must be offered to the customer to bring the net price to INR 108/-
If 'a' and 'b' are positive integers such that a2-b2 = 19, then the value of 'a' is :
The price of a bicycle is marked by a trader at INR 1000. He sold the bicycle allowing successive discounts of 20%, 10% and 5%. Thus the trader gained 14% then the cost price of bicycle (in rupees) is: