A can do a piece of work in 14 days. When he had worked for 2 days B joins him. If the complete work was finished in 8 days. In how many days B alone can finish the work?
Options:
(A) 18
(B) 77
(C) 66
(D) 55
(E) 14

8/14 + 6/x = 1
X = 14 days So the answer is: (E).

If the cost price of 50 articles is equal to the selling price of 20 articles, then the gain or loss percent is?
Options:
(A) 16
(B) 127
(C) 12
(D) 18
(E) 150

Percentage of profit = 30/20 * 100 = 150% So the answer is: (E).

What is the difference between 80% of 170 and 35% of 300.
Options:
(A) 30
(B) 29
(C) 37
(D) 36
(E) 31

(80/100) * 170 (35/100) * 300
136 - 105 = 31 So the answer is: (E).

John left home and drove at the rate of 35 mph for 2 hours. He stopped for lunch then drove for another 3 hours at the rate of 55 mph to reach his destination. How many miles did John drive?
Options:
(A) 235 miles.
(B) 245 miles.
(C) 255 miles.
(D) 265 miles.
(E) 275 miles.
The total distance D traveled by John is given by
D = 35 * 2 + 3 * 55 = 235 miles. So the answer is: (A).