Question

the 3 cubes of silver edges 3 cm,4cm,5cm are emlted and recast into a single cube find the cost of the coating the surface new cube with gold at rate of rs3.50 per sq.cm​

Answer 1

Answer:

Step-by-step explanation:

volume of first cube= 3×3×3

=27

Volume of 2nd cube=4×4×4

=64

Volume of 3rd cube=5×5×5

=125

Sum= 27+64+125

=216

cube root of 216 = 6

Total cost = 6×3.50

=21.

Therefore, 21Rs.

Answer 2

S1= 3cm

S2= 4cm

S3=5cm

V of cube : S³

V1= 3³= 27cm³

V3= 4³= 64cm³

V3= 5³= 125cm³

TOTAL:- 216cm³

V4= 216 cm³

S4³= 216 cm³

S4= ³√126 = 6cm

TSA of a cube = 6S²

TSA = 6×36

= 216cm²

Cost of coating = 216×3•5 cm

= rs. 756

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