Given below are three quantities named 1, 2 and 3. Based on the given information, you have to determine the relation among the three quantities. You should use the given data and knowledge of Mathematics to choose between the possible answer. The options represent the relations among three quantities. A. < B. > C. ≤ D. ≥ E. = Quantity 1: There is a square field of side 4 meter. A flower bed is to be prepared in its centre, leaving a gravelled path of uniform length around the flowerbed. The cost of preparing the flowerbed and gravelling the path is Rs. 100 and Rs. 200 per square meter respectively. If the total cost is Rs. 1756 then find the double of width of gravelled path. Quantity 2: The height of a cone is 45 cm. A small cone is cut from it parallel to the base. If the ratio of volume of small cone and the remaining part is 8 : 19 then what is the height from the base from where the cone was cut? Quantity 3: A cylindrical container of radius 60 cm and height 150 cm is filled with ice cream. 10 cones of equal volume need to be prepared from the whole ice-cream. These cones has hemispherical top and the height of the conical portion is 4 times the radius of hemisphere. Find radius of the hemisphere.
Given below are three quantities named 1, 2 and 3. Based on the given information, you have to determine the relation among the three quantities. You should use the given data and knowledge of Mathematics to choose between the possible answer. The options represent the relations among three quantities. A. < B. > C. ≤ D. ≥ E. = Quantity 1: There is a square field of side 4 meter. A flower bed is to be prepared in its centre, leaving a gravelled path of uniform length around the flowerbed. The cost of preparing the flowerbed and gravelling the path is Rs. 100 and Rs. 200 per square meter respectively. If the total cost is Rs. 1756 then find the double of width of gravelled path. Quantity 2: The height of a cone is 45 cm. A small cone is cut from it parallel to the base. If the ratio of volume of small cone and the remaining part is 8 : 19 then what is the height from the base from where the cone was cut? Quantity 3: A cylindrical container of radius 60 cm and height 150 cm is filled with ice cream. 10 cones of equal volume need to be prepared from the whole ice-cream. These cones has hemispherical top and the height of the conical portion is 4 times the radius of hemisphere. Find radius of the hemisphere. Correct Answer B, A
Quantity 1:
Suppose X and Y are the areas of square flowerbed and gravelled path respectively,
⇒ Area of the square field = 4 × 4 = 16 m2
⇒ X + Y = 16 ---- (1)
Since the cost of preparing the flowerbed and gravelling the path is Rs. 100 and Rs. 200 per square meter respectively,
⇒ 100X + 200Y = 1756
From equation 1 and 2:
⇒ X = 14.4
⇒ Area of the square flowerbed = 14.4 m2
⇒ Side of square flowerbed = 3.8 m
⇒ Width of double of gravelled path = (4 – 3.8) = 0.2 m = 20 cm
Quantity 2:
Since the ratio of volume of small cone and the remaining part is 8 ∶ 19
⇒ Ratio of volume of small cone and full cone = 8 ∶ = 8 ∶ 27
Suppose the radius of small and large cone is ‘r’ and ‘R’ respectively and the heights are ‘h’ and ‘H’ respectively
⇒ ∶ = 8 ∶ 27
From the figure,
r/R = h/H
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⇒ h3/H3 = 8/27
⇒ h/H = 2/3
Since H = 45 cm
⇒ h = 45 × 2/3 = 30 cm
⇒ Height from the base from where the cone was cut = 45 – 30 = 15 cm
Quantity 3:
Volume of the cylindrical container = 22/7 × 60 × 60 × 150 cm3
Volume of a cone with hemispherical top = πr2h/3 + 2πr3/3
Putting h = 4r,
Volume of a cone with hemispherical top = 4πr3/3 + 2πr3/3 = 2πr3
Volume of 10 such cones = 20πr3
⇒ 20πr3 = 22/7 × 60 × 60 × 150
⇒ r3 = 27000 cm3
⇒ r = 30 cm
∴ Quantity 1 > Quantity 2 < Quantity 3