A man wants to exchange 1000 in two type of notes of 5 and 19 denomination. If he has 180 notes in all find the number of notes of each kind .
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Firstly, we know from the problem x + y = 180 in total notes of both dominations. Using eq 1 substitute the value of x = 160, y = 180 - 160 = 20. which gives us the answer, the man would need 160 rs5 notes and 20 rs19 notes to exchange rs1000
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