a sum of 500 rupees is in the form of denominations of 5 rupees and 10 rupees. If the total number of notes is 90 find the number of notes of each denomination
(hint:let the number of 5 rupee notes be 'x', then number of 10 rupee notes=90-x
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so let's start
5x + 10 (90-x) = 500
5x + 900 - 10x = 500
5x - 10x = 500 - 900
-5x = -400
x = 400/5
x = 80
so 5's notes are 80 and 10's notes are 90-80=10
5x + 10 (90-x) = 500
5x + 900 - 10x = 500
5x - 10x = 500 - 900
-5x = -400
x = 400/5
x = 80
so 5's notes are 80 and 10's notes are 90-80=10
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I hope it will help you
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