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Answer to Q 2 :
Assume that the cost of an article is 100.
Hence, gain on the cost = 100 * 25% = 25.
Therefore, Selling price of an article is 100+25= 125.
Now, 125 * r% = 25
Therefore, r = ( 25 * 100 )/125 = 20%
Alternatively,
25% = 1/4
If cost of an article is x, then the gain is x/4
and the selling price will be x+ x/4 = 5x/4.
gain = x/4 which is 1/5 * 5x /4
1/5 = 20 %
hence r = 20%
Hope this helps
1. I am not sure of this one but here is a possible solution:
x= y+2/3
therefore y/x = y/ (y+2/3)
that is = y/ ((3y+2)/3)
That is 3y/3y+2
If a value is expected here, then something is missing from the stem.
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