What approximate value should come in place of question mark (?) in the following equation
287.532 + 1894.029 657.48 = 643.095 + ?
Options:
(A) 870
(B) 790
(C) 880
(D) 770
(E) 890
Answer and stream of consciousness: (C)
Stream of consciousness: ? = 285 + 1895 655 645 or, ? = 880

Fifteen telegenic contestants with a variety of personality disorders are to be divided into two "tribes" of four members each, tribe A and tribe B, for a competition. How many distinct groupings of two tribes are possible?
Options:
(A) 120
(B) 126
(C) 252
(D) 1200
(E) 1365
Answer and stream of consciousness: (E)
Stream of consciousness: My ans is 15C4 = 1365

Consider a quarter of a circle of radius 20. Let r be the radius of the circle inscribed in this quarter of a circle. Find r.
Options:
(A) 20*(sqr2 -1)
(B) 8*(sqr3 -1)
(C) 4*(sqr7 - 1)
(D) 12* (sqr7 -1)
(E) None of these
Answer and stream of consciousness: (A)
Stream of consciousness: I got 20/(sqr2 +1) and just forgot to multiply by (sqr2 -1).

The compound ratio of 2/3, 6/7, 1/3 and 1/8 is given by?
Options:
(A) 7/98
(B) 1/48
(C) 1/98
(D) 1/96
(E) 1/68
Answer and stream of consciousness:
(C)
Stream of consciousness: 2/7 * 6/7 * 1/3 * 1/8 = 1/98