Book Maths Puzzle Numerical Ability

If both 11^2 & 3^3 are factors of the number ax4^3x6^6x13^11, then what is the smallest possible value of a?
a.121
b.3267
c.363
d.33

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Book Other Question

On 8th December ,2007 of the week was it on 8th december ,2006? a gols ornament weighing720g contains 90% of pure gold and rest silver.How much of silver(in grams)must be added so that the resultant mixture have 19% silver?