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The average weight of 9 mangoes increase by 20 grams if one of them weighting 120 grams is replaced by another. The weight of the new mango is ?
180 gm
200 gm
260 gm
300 gm
Let say average wt of 9 Mangoes = x gm
weight of 9 Mangoes = 9 x gm
Let say weight of mango which was replaced by 120gm mango = M gm
New weight of 9 Mangoes = 9x + M - 120 gm
New Average = x + 20 gm
9 (x + 20) = 9x + M - 120
= 9x + 180 = 9x + M - 120
= M = 300 gm
Hence, option 4 is the correct answer.
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