Question : If 18% of a number is 720, then what is 81% of the same number?

Option 1: 2280

Option 2: 1620

Option 3: 3240

Option 4: 3160

Question : If the price of a book first increased by 18% and then decreased by 18%. What is the net change in the price of the book?

Option 1: 18% increase

Option 2: 3.24% decrease

Option 3: No change

Option 4: 18% decrease

Question : If $\frac{3}{5}$ of 80% of a number is 450, then what is the number?

Option 1: 810.8

Option 2: 925.5

Option 3: 937.5

Option 4: 945.8

Question : There is a ratio of 5 : 4 between the two numbers. If 40 percent of the first number is 12, then 50% of the second number is:

Option 1: 12

Option 2: 24

Option 3: 18

Option 4: 20

Question : If a : b : c = 5 : 6 : 4, then what is the value of (a + b + c) : (3a + b – c)?

Option 1: 25 : 23

Option 2: 18 : 23

Option 3: 15 : 17

Option 4: 18 : 19

Question : If $\frac{2 x+3}{18 \div 3 \times 4+2}=\frac{12 \times 3+5}{2 \times 4 \div 2}$, then what is the value of $x$?

Option 1: 132.25

Option 2: 131.75

Option 3: 134.35

Option 4: 120.5