A) 23, 32
B) 11, 44
C) 17, 38
D) Data insufficient
Correct Answer: A
Solution :
Let cost of rice be x per kg and cost of dal be y per kg. \[5x+7y=339\] ...(i) and \[7x+5y=321\] ...(ii) On adding Eq. (i) and (ii), we get \[12x+12y=660\] or \[x+y=55\] ...(iii) On subtracting Eqs. (ii) from Eq. (i), we get \[-2x+12y=18,\,\,y-x=9\] ?(iv) On adding Eqs. (iii) and (iv), we get \[2y=64\] or \[y=32\] \[\therefore \] \[x=23\]You need to login to perform this action.
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