Question
A bag contains 10-paisa, 20-paisa and 50-paisa coins in
the ratio of 9:7:5, respectively. If the total amount in the bag is Rs. 48, then find 40% of the number of 20-paisa coins in the bag.Solution
Let number of 10 paisa, 20 paisa and 50 paisa coins be ‘9x’, ‘7x’ and ‘5x’, respectively. ATQ, (0.1 × 9x) + (0.2 × 7x) + (0.5 × 5x) = 48 Or, 0.9x + 1.4x + 2.5x = 48 Or, 4.8x = 48 So, x = 10 So, number of 20 paisa coins = 7x = 70 Therefore, required number of coins = 0.40 × 70 = 28
Find the area of sector of a circle whose radius is 21 cm and angle subtended by the sector at centre of circle is 45 ° .
The area of a square is 196 cm2 which is 68 cm2 less than that of a rectangle. Find the perimeter of the rectangle if the length o...
12 spheres of the same size are made by melting a solid cylinder of 12cm diameter and 12cm height. The Diameter of each sphere is.
A sphere is melted to form 81 identical cylinders. If radius of each cylindrical is 1/3rd of the radius of sphere and height of each cylinder...
The area of a circular garden is 616 m2. Find its radius. (Take pi = 22/7)
The shape of an toy is a right circular cylinder with a hemisphere on bottom and a right circular cone on the top. The radius of the cylindrical part is...
If a wheel covers a distance of 1760 m in 80 rotations, then the diameter of the wheel is?
The breadth of a rectangle is increased by 9 cm, it will become twice the length of the rectangle. If the new perimeter is 294 cm, then find the origina...
The length of a 540 metre long rope is 9 times the perimeter of a rectangular German park. Find the area of the rectangular park ...
Relevant for Exams:
