Question : How many KB is equal to 1 GB?

Option 1: 1024

Option 2: 256 x 1024

Option 3: 1024 x 1024

Option 4: 1024 x 1024 x 128

Question : If $( x^{3}-y^{3}):( x^{2}+xy+y^{2})=5:1$ and $( x^{2}-y^{2}):(x-y)=7:1$, then the ratio $2x:3y$ equals:

Option 1: $4:1$

Option 2: $2:3$

Option 3: $4:3$

Option 4: $3:2$

Question : If $x+ \frac{1}{x} =\sqrt{13}$, then $\frac{3x}{{x}^{2} -1}$ equals to:

Option 1: $\sqrt[3]{13}$

Option 2: $\frac{\sqrt{13}}{3}$

Option 3: 1

Option 4: 3

Question : $6\frac{1}{4}$% of 1600 + $12\frac{1}{2}$% of 800 equals:

Option 1: 100

Option 2: 200

Option 3: 300

Option 4: 400

Question : If $4x+5y=83$ and $3x:2y=21:22$, then $(y-x)$ equals:

Option 1: 3

Option 2: 4

Option 3: 7

Option 4: 11