Ray bought  roses and carnations. The roses cost $15 per dozen, the carnations cost $8 per dozen. He bought a total of 17 dozen flowers and paid a total of $192. How many roses did he buy?

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let x be the dozens of rose he bought and y be the number of carnations. 15x + 8y = 192--- (i)x + y = 17 --- (ii)multiplying eqn (ii) by 8, we get,8x + 8y = 136--(iii)Subtracting eqn (iii) by (i), we get,7x = 56thus, x = 8Therefore, he bought 8 dozen of roses.