Out of four numbers ,the average of first three is 16 and that of the last three is 15. If the last number is 22,the first number is :	Choices:
A) 22	B) 21	C) 77	D) 99	E) 25
25xplanation:   Let the numbers be a,b,c,d   Given, a + b + c = 48, b + c + d = 45   Now, d = 22   thus, b + c + 22 = 45 ⇒ b + c = 23   Putting the value of b + c in a + b + c = 48   a + 23 = 48 ⇒ a = 25   Answer: 25
<result>E</result>
Out of four numbers ,the average of first three is 16 and that of the last three is 15. If the last number is 22,the first number is :