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

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 C

Explanation:

9/11 = .818 , 8/9 = .88 , 3/5 = .6, 4/7 = .571

So order is 8/9 > 9/11 > 3/5 > 4/7

Answer: Option C

Explanation:

Can be easily solved with following formula
\begin{aligned}
a^2 - b^2 = (a - b)(a + b)
\end{aligned}

Answer: Option B

Explanation:

Just we need to take care to put decimal under decimal, rest add in a simple way

Answer: Option B

Explanation:

1/(60*60) = 1/3600 = .0027