An office used three types of envelopes: small, medium and large.
They used 160 small envelopes.
The no. of medium envelopes used was 5 times the no. of small envelopes plus 5/20 of the total no. of the envelopes.
The no. of large envelopes was equal to the no. of small envelopes plus 5/20 of the no. of medium envelopes.
Altogether, How many envelop did they use?
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