Of the four numbers, whose average is 40, the first is one-fourth of the sum of the last three. The first number is ?  Pick one:	A) 28	B) 29	C) 11	D) 32	E) 10
Explanation:   Let the first number be x,   Then, sum of the four numbers = x + 4x = 5x.   so, 5x/4 = 40 or x = (40 * 4) / 5= 
<gadget id="calculator">(40 * 4) / 5</gadget>
<output>32</output>
32   Answer: 32
<result>D</result>
Of the four numbers, whose average is 40, the first is one-fourth of the sum of the last three. The first number is ?