IMO Mathematics Olympiad Class 8: Questions 437  442 of 1029
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Question number: 437
Question
Three cubes whose edges are 3 cm, 4 cm, and 5 cm respectively are melted without any loss of metal into a single cube. The edge of new cube is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 438
Question
If a wire is bent into the shape of a square, then the area of the square is 49 sq. cm. When the wire is bent into a semicircular shape, then the area of the semicircle will be________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 439
Question
A child walked 13 m to cross a rectangular field diagonally. If breadth of field is 5 m, its length is________.
Choices
Choice (4)  Response  

a.  11 m 

b.  20 m 

c.  12 m 

d.  15 m 

Question number: 440
Question
The perimeter of a trapezoid is 80 cm and its nonparallel sides are each equal to 17 cm and its altitude is 15 cm. Its area is________.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 441
Question
The radii of the bases of two cylinders are in the ratio of 2: 3 respectively and their heights are in the ratio 1: 2 respectively, find the ratio of their volumes.
Choices
Choice (4)  Response  

a.  3: 2 

b.  1: 3 

c.  3: 4 

d.  2: 3 

Question number: 442
Question
Three solid cubes of sides 3 cm, 4 cm and 5 cm are melted to form a new cube. Find the surface area of the cube so formed.
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

