The average temperature of Monday, Tuesday, Wednesday and Thursday was 38∘ and that of Tuesday, Wednesday, Thursday and Friday was 40∘. If the temperature on Monday was 30∘, the temperature of Friday was :  Choose the correct choice: A) 40∘ B) 39∘ C) 38∘ D) 30∘ E) None of these
Explanation:   M+T+W+Th=(4×38)=152   Monday temparature is 30. So T+W+Th=(152-30)= 
<gadget id="calculator">(152-30)</gadget>
<output>122</output>
122   T+W+Th+F=(4×40)=160   F = (160-122)= 
<gadget id="calculator">(160-122)</gadget>
<output>38</output>
38∘   38∘orrect Option: 38∘
<result>C</result>
The average temperature of Monday, Tuesday, Wednesday and Thursday was 38∘ and that of Tuesday, Wednesday, Thursday and Friday was 40∘. If the temperature on Monday was 30∘, the temperature of Friday was :