The area of the base of a right circular cone is 400π and its height is 15 cm. The curved surface of the cone ( in cm²) is:

Direction: Study the following table carefully and answer the given questions. Table shows the of passed students in four schools and ratio between passed boys and girls among them. The ratio between failed boys and girls is reverse of passed ratio between them.

If in school P, 100 girls are failed in the exam, then find the total number of students in school P. 

Difference of two numbers is 1890. If 12.5% of one number is 17.5% of the other number, Find the two numbers.

A man purchased a bedsheet for₹ 450 and sold it at a gain of 10% calculated on the selling price. The selling price of the bedsheet was 

A man earns a profit of 60% when he sells an article at 4/3 of the original selling price. Find the percent profit he makes at original price.

Surekha borrowed a sum of money and returned it in two equal annual instalments of ₹5,547 each. If the rate of interest was $$7{1\over 2}\%$$ p.a. compounded yearly, then the total interest paid by her was:

The ages of Shyam and Mohan are in the ratio of 11: 13 respectively after 7 years the ratio of their ages will be 20: 23. What is the difference in years between their ages?

If A: B=7: 9 and B:C =5 :6 then value of A:C