Question

solve this problem ​

Answer 1

Given →

Dimensions of led block are =

10 cm×5cm× 6cm .

This is recasted into cuboid having

Width = 2 cm and height = 10 cm .

To find →

Length of new cuboid .

Solution →

We know that wether we will change the dimensions of the given shape but the volume of these shapes will remain same So here also volume of led box and cuboid are similar .

✯Volume of cuboid = l×b×h

Volume of led box = volume of cuboid.

10 × 5 × 6 = l × 2 × 10

300. = 20 l

300/20. = l ( here l = length)

15. = l

So, length of cuboid is 15 cm .

Answer 2

Answer:

Length is 15 centimetres.

Step-by-step explanation:

Volume of the rectangular block before casting is V = 10×5×6 cm∧3.

Let the length be L cm

Volume of the new  cuboid is V' = 10×2×L cm∧3.

As the lead has just changed the dimensions with the same amount of lead, so its volume remains same.

Thus,  V=V'

10×5×6=10×2×L

L=(10×5×6)/(10×2)

L=5×3

L= 15 cm