Of the four numbers, whose average is 50, the first is one-fourth of the sum of the last three. The first number is ?
Choose the correct choice from the following answers.
A) 28 B) 29 C) 11 D) 48 E) 40
Explanation:   Let the first number be x,   Then, sum of the four numbers = x + 4x = 5x.   so, 5x/4 = 50 or x = (50 * 4) / 5= 
<gadget id="calculator">(50 * 4) / 5</gadget>
<output>40</output>
40   Answer: 40
<result>E</result>
Of the four numbers, whose average is 50, the first is one-fourth of the sum of the last three. The first number is ?