How many kilograms of rice cost 9 rs per kg mixed with 27 kg pf rice costing 7 rs per kg?
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Let x kg rice of cost rs 9 per kg with 27 kgs of rice of cost rs y per kg be mixed to get a mixture rice cost rs7 per kg
9x +27y=(x+27)7
2x +27y=27(7)
it implies 2(27)+27(5)= 27(7)
x=27and y=5
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