The average weight of 10 persons increases by 4.2 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person? Choose the most appropriate option:
A) 107 kg  B) 80 kg  C) 120 kg  D) 90 kg  E) 100
Solution   Total weight increased	= (10 x 4.2)kg   = 42 kg.   Weight of new person	= (65 + 42)= 
<gadget id="calculator">(65 + 42)</gadget>
<output>107</output>
107kg.   107 kgnswer 107 kg
<result>A</result>
The average weight of 10 persons increases by 4.2 kg when a new person comes in place of one of them weighing 65 kg. What might be the weight of the new person?