Of the 5 numbers, whose average is 150, the first is one-fourth of the sum of the last 4. The first number is?
Select the correct option.
A) 100  B) 80  C) 70  D) 150  E) 60
Total of 5 numbers = 5 * 150= 
<gadget id="calculator">5 * 150</gadget>
<output>750</output>
750   Let total of last 4 numbers= x   1st number = x/4   x+ x/4 = 750   5x = 3000 =&gt; x =600   1st number = 600/ 4= 
<gadget id="calculator">600/ 4</gadget>
<output>150</output>
150   Answer : 150
<result>D</result>
Of the 5 numbers, whose average is 150, the first is one-fourth of the sum of the last 4. The first number is?