What is the volume of the cube?
I. Its total surface area is 150 cm².
II. Its edge is a whole number of centimetres.
I: 6a² = 150 → a = 5 → volume 125 cm³. Sufficient.
II: any whole-number edge fits. Not sufficient.
Volume and Surface Area · Exercise 5 of 5
20 data sufficiency questions on volume and surface area.
Directions: each question is followed by two statements. Decide whether the data in the statements is sufficient to answer the question, and choose the matching option.
What is the volume of the cube?
I. Its total surface area is 150 cm².
II. Its edge is a whole number of centimetres.
I: 6a² = 150 → a = 5 → volume 125 cm³. Sufficient.
II: any whole-number edge fits. Not sufficient.
What is the volume of the cylinder?
I. Its radius is 7 cm.
II. Its height is 10 cm and its curved surface area is 440 cm².
I alone: height unknown. Not sufficient.
II: 2πr × 10 = 440 → r = 7 → V = 1,540 cm³. Sufficient.
What is the edge of the cube?
I. Its volume is 343 cm³.
II. Its main diagonal is 7√3 cm.
I: ∛343 = 7 cm. Sufficient.
II: a√3 = 7√3 → a = 7 cm. Sufficient.
What is the volume of the cuboid?
I. Its base area is 48 cm².
II. Its height is 5 cm.
I alone: height unknown. Not sufficient.
II alone: base unknown. Not sufficient.
Together: 48 × 5 = 240 cm³. Sufficient.
What is the volume of the cone?
I. Its base radius is 7 cm.
II. Its curved surface area is more than 150 cm².
I alone: height unknown. Not sufficient.
II gives only a lower bound. Not sufficient.
Together: with r = 7, heights 10 and 24 both give a curved surface above 150. Not sufficient.
What is the radius of the sphere?
I. Its surface area is 616 cm².
II. Its volume is more than 1,000 cm³.
I: 4πr² = 616 → r = 7 cm. Sufficient.
II: radii 7 and 8 both exceed 1,000 cm³. Not sufficient.
How many litres does the tank hold?
I. The tank is 2 m long.
II. The tank is a cube with edges of 2 m.
I alone: width and depth unknown. Not sufficient.
II: 2³ = 8 m³ = 8,000 litres. Sufficient.
A cylinder has radius 7 cm. What is its height?
I. Its volume is 1,540 cm³.
II. Its curved surface area is 440 cm².
I: 22/7 × 49 × h = 1,540 → h = 10 cm. Sufficient.
II: 2 × 22/7 × 7 × h = 440 → h = 10 cm. Sufficient.
What is the slant height of the cone?
I. Its base radius is 5 cm.
II. Its height is 12 cm.
Each alone gives only one of r and h. Not sufficient.
Together: √(25 + 144) = 13 cm. Sufficient.
What is the volume of the cuboid?
I. Its length is twice its breadth.
II. Its height is 5 cm.
I gives only a ratio. Not sufficient.
II gives only the height. Not sufficient.
Together: the breadth is still unknown. Not sufficient.
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