The ratio of present ages of Ratna and Shantanu is 5:4. After 19 years, the ratio of their ages will be 10:9. What is Ratna's present age?

If the length of a rectangle increases by 50% and the breadth decreases by 25%, then what will be the percent increase in its area?

The radii of three concentric circles are in the ratio of 4 : 5 : 7. What is the ratio of the area between the two inner circles to that between the two outer circles?

The diagonal of a square is equal to the side of an equilateral triangle. If the area of the square is $$ {18\sqrt{3}}$$ sq.cm. What is the area (in cm²) of the equilateral triangle ?

The diagonal of a square is 14 cm. What will be the length of the diagonal of the square whose area is double of the area of first square?

A circular wire of radius 49 cm is bent in the form of a rectangle whose sides are in the ratio of 6:5 the smaller side of the rectangle is 

If three people weave 336 shawls in 14 days, then how many shawls are weaved by 8 persons in 5 days?

What is the L.C.M of 12, 36, 6 and 9?