Interview Maths Puzzle Numerical Ability

It cost 10 cents a km to fly and 12 cents a km drive. If you travel 20 km's, flying 'y' km's of distance and drive the rest then the cost of the trip in dollar is?

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Interview Other Question

The operation * applied to a numbers give as itss result 10 subtracted from twice the number? what is *(*9)?

a)-11 b)6 c) 9 d)8 e) none
what percentage of the no from 1 to 50 have square that end in lost digit 1?