Find the mass

The total mass of 1 packet of sugar and 1 packet of flour is 230g .The total mass of 1 packet of sugar and 1 packet of cocoa powder is 185g .The total mass of 3 packets of sugar,5 packets of flour and a packet of cocoa powder is 1005g.
(a)Find the mass of 1 packet of flour .
(a)Find the difference between the mass of 1 packet of sugar and 1 packet of cocoa powder .

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