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Susan made a block with small cubes of 7 cubic cm volume to make a block 4 small cubes long,
4 small cubes wide and 10 small cubes deep. She realises that she has used more small cubes than she really needed.
She realised that she could have glued a fewer number of cubes together to look like a block with same dimensions,
if it were made hollow. What is the minimum number of cubes that she needs to make the block?

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TCS Other Question

# 14 ) On planet zorba, a solar blast has melted the ice caps on its equator. 8 years after the ice melts, tiny plantoids called echina start growing on the rocks. echina grows in the form of a circle and the relationship between the diameter of this circle and the age of echina is given by the formula
d = 4 * v (t - 8) for t = 8
where d represents the diameter in mm and t the number of years since the solar blast.
Jagan recorded the radius of some echina at a particular spot as 8mm. How many years back did the solar blast occur?
a) 24 b) 12 c) 8 d) 16

A power unit is by the bank of a river 1500m wide.
It is required to construct a power plant on the side of the river opposite to the power unit and 3000mfrom the unit.
A cable has to be laid from the power unit to the power plant.
The cost of laying the cable under water and on the land is Rs 100 per m and Rs 10 per m respectively.
If we want to minimize the total cost of laying the cable,
where should the plant be located?