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CP of 11 Oranges =55Rs. CP of 1 Orange =55/11=5Rs. SP of 1 orange at the 20% interest rate=5×120/100 =6Rs. Oranges can be sold for Rs 54=54/6 =9Rs.
Determine the value of a − b given that a + 3b = 18a and 3a + b = 30 .