SOLUTION: We have 171 kg rice custing 7 rs/kg.we have rice at 11 rs/kg and 2 rs/kg .then after mixing 11 rs/kg and 2 rs/kg rice. What is quantity of 11 rs/kg rice ..

Question 344406: We have 171 kg rice custing 7 rs/kg.we have rice at 11 rs/kg and 2 rs/kg .then after mixing 11 rs/kg and 2 rs/kg rice. What is quantity of 11 rs/kg rice ..
Answer by josmiceli(19441) (Show Source): You can put this solution on YOUR website!
Let = kg of 11 rs/kg rice needed
Let = kg of 2 rs/kg rice needed
= cost of 11 rs/kg rice
= cost of 2 rs/kg rice
= cost of 7 rs/kg rice
given:
(1)

(2)
Multiply both sides of (1) by
and subtract (1) from (2)
(2)
(1)

The quantity of 11 rs/kg rice needed is 95 kg
And, from (1):

check answer:
(2)
(2)

OK
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