The population of town A is 4800 more than town B. If 3100 people move from town B to town A, the population of town A will be 11 times that of town B. Find the sum of the original population of the two towns.
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let, the population of town b = x
orignal population of both towns are =
x + 7900 = 11x
7900 = 11x -x
7900 = 10x
7900 ÷ 10 = x
x = 790
population of town A = 8690
population of town B = 790
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