दूध और पानी को किस अनूपात में लेकर मिलाय...

दूध और पानी को किस अनूपात में लेकर मिलाया जाए कि प्राप्त मिश्रण को क्रय मूल्य पर बेचने से 20% का लाभ हो ?

A

`1:4`

B

`1:6`

C

`1:5`

D

`5:1`

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