If 144/0.144 = 14.4/x, then x = ?

Answer: Option A

Answer: Option C

Explanation:

$$\begin{aligned} a^3 + b^3 = (a+b)(a^2 + b^2 - ab) \end{aligned}$$

$$\begin{aligned} = \frac{10.3^3 + 1^3} {10.3^2 + 1^2 - 10.3 \times 1} \end{aligned}$$

$$\begin{aligned} = (a+b) = (10.3+1) = 11.3 \end{aligned}$$

Answer: Option D

Explanation:

5/8 = .625, 7/12 = .5833, 3/4 = .75, 13/16 = .8125

So order will be
7/12 < 5/8 < 3/4< 13/16

Answer: Option A

Answer: Option C

Explanation:

Use following formula to solve it quickly
$$\begin{aligned} \frac{a^2-b^2}{a-b}=\frac{(a+b)(a-b)}{(a-b)} = (a+b) \end{aligned}$$
= (2.39+1.61) = 4