Of the 5 numbers, whose average is 80, the first is one-fourth of the sum of the last 4. The first number is?	Answers.
A) 83	B) 80	C) 78	D) 56	E) 67
Total of 5 numbers = 5 * 80= 
<gadget id="calculator">5 * 80</gadget>
<output>400</output>
400   Let total of last 4 numbers= x   1st number = x/4   x+ x/4 = 400   5x = 1600 =&gt; x =320   1st number = 320/ 4= 
<gadget id="calculator">320/ 4</gadget>
<output>80</output>
80   Answer :80
<result>B</result>
Of the 5 numbers, whose average is 80, the first is one-fourth of the sum of the last 4. The first number is?