# maths --plse help me..

In a purse there are 20-rupee notes 10-rupee notes and 5-rupee notes. the number of 5-rupee notes exceeds two times the 10-rupee notes by one. the 20-rupee notes are 5 less than the 10-rupee notes. if the total value of the money in the purse is Rs185 find the number of each variety of notes.

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1. if there are x,y,z notes for 5,10,20 rupees, respectively, then

x = 2y+1
z = y-5
5x+10y+20z = 185

(x,y,z) = (15,7,2)

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2. 2,7,15

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