A sum of Rs.500 is in the form of denominations of Rs.10 and Rs.20.If total number of notes are 45,find the number of notes of each denomination.
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Answer:
answer is 575
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answer ~~ 10x+20y=500--(i)
x+y =45
10x+10y =450--(ii)
from (i) to (ii)
10y=50 , y=5
x=40.
40x= 40*10=400
5y = 5*20= 100
total =500
hence proved
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