Question

of the box
A). Three cubes whose edges measure 3cm, 4cm and 5cm respectively are recasted to form a
single cube. Find its edge. Also, find the surface area of the new cube.
B). The edges of three metallic cubes are in the ratio 3: 4:5. These cubes are recasted into a
single cube whose diagonal is 12 V3 cm. Find the edges of the three edges.
The length of a cylindrical metallic pipe is 14cm. The difference between the outside and inside surf
areas is 44cm'. Find the outer and inner radius of the pipe, if the pipe is made up of 110cm of meta​

Answer 1

Answer:

Volume of 3 cubes = volume of the new cube.

3^3+4^3+5^3

27+64+125

=216

Cube root of 216 = the edge of the new cube

Which is equal to 6 cm

CSA= 4a^2

4*6^2

4*36

144 cm^2