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A hollow cube of size 5cm is taken with a thickness of 1cm. It is made of smaller cubes of size 1cm. If only 2 faces of the outer surface of the cube are painted totally ,how many faces of the smaller cubes remain unpainted?
a)210 b)465 c)450 d)538

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TCS Other Question
the citizens of planet oz are 9 fingered and have thus developed their decimal system in base .A certain street in oz contains 100 buildings (in base 9) numbered 1 to 100. How many 8s are used in numbering these building (in base 10)
a)18 b)20 c)16 d)9
 A cyclist buys a cycle for 40 pounds and pays with a 57 pounds cheque. The seller changes the cheque next door and gives the balance 17 pounds to the cyclist. The cheque bounced and the seller was forced to repay his neighbour . if the cycle cost the seller 7 pounds, then what was his loss?
a)57 pounds b)24 pounds c)47 pounds d)7 pounds