If 50 litres sample of glycerin there is 20% of impurity. How much pure glycerin should be mix in it to make the impurity 5%?

In the two regular polygon number of sides are in the ratio 5 : 4. If difference between their internal angles is 6°, then number of sides in the polygon is

The semi perimeter of a triangle is S and its centroid is G. What is the distance between G and centroid of the triangle formed by mid points of the sides of the given triangle?

If lines are drawn from the point (–5, 3) to the coordinate axes then area of quadrilateral formed by these lines with coordinate axes is

If b>a, b>c, then area of quadrilateral formed by straight line x=a, x=b, y=c and y=d is

The circumference of a 1925 cm² semicircle is equal to the width of a rectangle. If length of the rectangle is equal to the perimeter of a square of side 48 cm then perimeter of the rectangle is

The area of a square is three times area of a given rectangle. The length of rectangle is 5 cm more that 5² which is thrice its width. Perimeter of the square is

The length and breadth of a room are 8 m and 6 m respectively. A cat runs along all the four walls and finally along a diagonal order to catch a rat. How much total distance is covered by the cat?

The ratio of number of boys and girls in a school of 720 students is 7 : 5. How many more girls should be admitted to make the ratio 1 : 1 ?

In a mixture of 25 liters, the ratio of acid to water is 4 : 1. Another 3 liters of water is added to the mixture. The ratio of acid to water in the new mixture is: