A sum of Rs. 1000 is in the form of 50-rupee and 20-rupee notes. If the total number of notes be
75 find the number of notes of each kind.
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Step-by-step explanation:
x+y = 1000
x=75-y EQ. 1
20x + 50y = 1000 EQ. 2
substituting EQ.1 in EQ.2
20(75-y) + 50y = 1000
1500 - 20y + 50y = 1000
1000-1500= 30y
-500 = 30y
y = -5
x = 75 -(-5)
x = 80
80 notes of 20 rupees
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