Question

There are two alloys of platinum, silver and gold. The first alloy is known to contain per cent of platinum and the silver alloy per cent of copper. The percentage of gold is the same in both alloys. Having alloyed kg of the first alloy and kg of the second, we get a new alloy which contains per cent of gold. How many kg of platinum are there in the new alloy?

Hard

Solution

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FIRST ALLOY
Alloy is used.
% is platinum in first alloy
of PLATINUM
SECOND ALLOY
ALLOY is used
% of silver 
New alloy has % gold  gold
since both contain same % of gold % of % of

%
In second alloy % of platinum is there
% of
In new Alloy Platinum is

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