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Answer

A packet of sugar weighs 1.6kg and a packet of rice weighs ( 1.6 + 1.8) kg = 3.4 kg.

If the shopkeeper has u packets of sugar , he has ( u- 24 ) packets of rice.

1.6u + 3.4 (u – 24) = 278.4

5u = 360

u = 72

He has 72 packets of sugar.

 

Check : 72* 1.6 + 48 * 3.4 = 278.4

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