The correct answer is 10 N to the left.
Let us recall that when two vectors acts in the same direction, the resultant vector is obtained by adding the two vectors.
Similarly, when vectors act in opposite direction, the resultant vector is obtained by subtracting the vectors.
The resultant of the all the vectors shown in the diagram is obtained by adding the two vectors shown on the right and subtracting the result from the magnitude of the vector shown on the left as follows;
Resultant vector = 60 N - (30 N + 20 N)
Resultant vector = 60 N - 50 N
Resultant vector = 10 N
The direction of this resultant vector is towards the left.
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