Question

The average height of each person in group 'I' having 36 people is 18 cm less than the average height of each person in group 'J' having 30 people. If the sum of the heights of all people in group 'I' is the same as that in group 'J', then what is the average height of a person in group 'J'?

A 120 cm
B 108 cm
C 104 cm
D 128 cm
E None of these
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