Richard M. answered 10/03/17
Tutor
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Experienced Math & Science teacher tutoring students in trigonometry
This is a logic problem.
1/2 x sold + 1/2 x given away +10 cannot equal x.
And how can you give half the mangoes away to 3 friends as well as selling half, which totals to 4 halves.
And there's 10 left over!!
This problem is written wrong.
My physics professor at El Camino College, Jules Sumner Miller, told us, "I can't answer your question if you can't ask it".