The average of first 10 odd numbers is?
Options:
(A) 11
(B) 10
(C) 99
(D) 77
(E) 65

Sum of 10 odd no. = 100
Average = 100/10 = 10 So the answer is: (B).

In what time will a railway train 70 m long moving at the rate of 36 kmph pass a telegraph post on its way?
Options:
(A) 5 sec
(B) 4 sec
(C) 3 sec
(D) 7 sec
(E) 1 sec

T = 70/36 * 18/5 = 7 sec So the answer is: (D).

Ravi can do a piece of work in 30 days while Prakash can do it in 40 days. In how many days will they finish it together?
Options:
(A) 17 1/7 days
(B) 27 1/7 days
(C) 23 2/7 days
(D) 16 4/11 days
(E) none of these

1/30 + 1/40 = 7/120
120/7 = 17 1/7 days So the answer is: (A).

Divide Rs.32000 in the ratio 3:5?
Options:
(A) 12000, 20000
(B) 12000, 200098
(C) 12000, 20007
(D) 12000, 20006
(E) 12000, 20001

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
3/8 * 32000 = 12000
5/8 * 32000 = 20000 So the answer is: (A).