## Solution
120/10 = 12. The difference is 12- 10 = 2.
## What the question and answer could be
A certain car uses 12 gallons of gasoline in traveling 120 miles. In order for the car to travel the same distance using 10 gallons of gasoline, by how many miles per gallon must the car’s gas mileage be increased?
Options:
(A) 2
(B) 4
(C) 6
(D) 8
(E) 10
(A)

## Solution
Final number = original number - 30%(original number) = 50 - 30%(50) = 50 - 15 = $35.
## What the question and answer could be
Amanda sees a sale for 30% off all items, she sees a dress on sale that originally cost $50. How much will it cost Amanda to buy the dress after the sale amount of 30% has been take off?
Options:
(A) $40
(B) $35
(C) $50
(D) $65
(E) $15
(B)

## Solution
(900*3*3)/100 = 81
920 + 81 = 1001
## What the question and answer could be
Rs.900 amounts to Rs.920 in 3 years at simple interest. If the interest is increased by 3%, it would amount to how much?
Options:
(A) Rs.1056
(B) Rs.1001
(C) Rs.2056
(D) Rs.1026
(E) Rs.1856
(B)

## Solution
The differences between two successive terms from the beginning are 7, 5, 7, 5, 7, 5. So, 40 is wrong.
## What the question and answer could be

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
Find the invalid no.from the following series 13, 18, 25, 30, 37, 40
Options:
(A) 21
(B) 25
(C) 40
(D) 47
(E) 58
(C)