A man has in all rs. 640 in the denominations of one-rupee, five-rupee and ten rupee notes. the number of each type of notes are equal. what is the total number of notes he has?
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1*x + 5*x + 10*x = 640
`16x = 640
x = 40
thus, he has 40 notes of each type and total 120 notes.
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