Answer:

Explanation:
Given that,
Rs. 800 = 5 packets of tea
Using unitary method
Divide 800 to both sides
Rs. 1 = 5/800 packets of tea
Rs. 1 = 1/160 packets of tea
Multiply 1280 to both sides
Rs. 1 x 1280 = 1/160 x 1280 packets of tea
Rs. 1280 = 1280/160 packets of tea
Rs. 1280 = 8 packets of tea
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