A grocer buys two kind of rice at Rs.1.8...

A grocer buys two kind of rice at Rs.1.80 and Rs.1.20 per kg respectively In what proportion should these be mixed, so that by selling the mixture at Rs.1.75 per kg, `25%` may be gained ?

2 : 1

3 : 2

3 : 4

1 : 2

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