Question

9) Out of 20 liters, a milkman sells some milk at Rs 18 per liters and the remaining at Rs 20 per liter.
he gets Rs. 376 on selling it how much milk her sell at each rate.
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Answer 1

he sell 12Lit by rate Rs 18 per lit and 8Lit by rate Rs 20 per lit
as
18x + 20y = 376
x + y = 20
by solving simultaneously you will get ans

Answer 2

well it is a question of basic maths.....best of luck