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Now,

Let 60 % of mangoes weigh X grams and,

40 % of mangoes weigh Y grams

Let total number of mangoes be "n".

A/Q

\(350 = {X \over 0.6n}\) ⇒ \(350*0.6 = {X \over n}\) ⇒ \(210 = {X \over n}\) ------------------------- (1)

\(400 = {Y \over 0.4n}\) ⇒ \(400*0.4 = {Y \over n}\) ⇒ \(160 = {Y \over n}\) --------------------------(2)

(1) + (2)

\(210 + 160 = { X + Y \over n}\)

⇒ \(370 = {Total Wt. \over n}\)

Therefore, Average Weight of mangoes =** 370 grams**