self Maths Puzzle

A man invests a part of Rs 10000 at 5% and the remainder at 6%. The 5% investment yields annually Rs 76.50 more than the 6% investment. The amount invested at 6% is

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self Other Question

what is the value of
(x-a)(x-b).......(x-z)
A and B are two alloys of gold and copper prepared by mixing metals on the ratios 5:3 and 5:11 respectively. Equal quantities of these alloys are melted to form a third alloy C. The ratio of gold and copper in the alloy C is :