Practice Area – Four concentric circles are given .The radius of 1st circle is x.next is 2x,then 3x and 4x. Given that area between 2nd and 1st is A and 4th and 3rd circles being B. Find ratio of A to B
Practice Area – A closed wooden box of thickness 0.5 cm and length 21 cm, width 11 cm, and height 6 cm, is painted on the inside. The cost of painting is Rs 70. What is the rate of painting in rupees per sq. cm?
Practice Area – If the radius of a circle is increased by 20% then the area is increased by:
Practice Area – Two circles touch each other externally. The distance between their centres is 14 cm and the sum of their areas is 130 cm^2. Find their radii.
Practice Area – A store owner is packing small radios into larger boxes that measure 25 in. by 42 in. by 60 in. If the measurement of each radio is 7 in. by 6 in. by 5 in., then how many radios can be placed in the box?
Practice Area – A thermal chimney of circular cross section has outer and inner radii of 3m and 2m respectively. Find the cost of cement finishing for the inner and outer surface at Rs20 per sq.meter, if the height of the chimney is 56m.
Practice Area – In a square , all the mid points are joined. the inner square is shaded. If the area of the square is A, what is the shaded area?
Practice Area – If the depth of a tree is 3 levels, then what is the size of the Tree?
Practice Area – A sphere is cut into 4 identical pieces after it was painted. What is the ratio of the painted area to the unpainted area?
Practice Area – How big will an angle of one and a half degree look through a glass that magnifies things three times?
Practice Area – The area of a square field is 24200 sq m. How long will a lady take to cross the field diagonally at the rate of 6.6 km/hr?
Practice Area – Four horses are tethered at 4 corners of a square field of side 70 metres so that they just cannot reach one another. The area left ungrazed by the horses is:
Practice Area – How many squares can be formed using the checkered 1 * 1 squares in a normal chessboard?
Practice Area – Find the number of the bricks, each measuring 25 cm by 12.5 cm by 7.5 cm, required to build a wall 6 m long, 5 m high and 50cm thick, while the mortar occupies 5% of the volume of the wall.
Practice Area – Mr. loyd wants to fence his Square shaped land of 120Sqft each side.If a pole is laid every 12ft how many poles do he need?