100 + 50 * 2 = ?

Answer: Option B

Explanation:

= (31/10) * (3/10) + (7/5) / 20
= (3.1) * (.3) + (1.4) / 20
= 0.93 + 0.07
= 1

Answer: Option C

Explanation:

Remember the formula, if not then cram it :)

$$\begin{aligned} 2ab = (a^2 + b^2)- (a-b)^2 \end{aligned}$$
=> 2ab = 29 - 9 = 20
=> ab = 10

Answer: Option B

Explanation:

$$\begin{aligned} = 16-[5-(6+2(7-8+5))] \end{aligned}$$
(Please check due to overline, sign has been changed)
$$\begin{aligned} = 16-[5-(6+2 \times 4))] \end{aligned}$$
$$\begin{aligned} = 16-[-9] = 16 + 9 = 25 \end{aligned}$$

Answer: Option C

Explanation:

N * 50 = (325000 - 300000) = 25000
N = 25000 / 50
= 500

Answer: Option C

Explanation:

$$\begin{aligned} = \frac{1}{2+\frac{1}{2+\frac{1}{\frac{3}{2}}}} \end{aligned}$$
$$\begin{aligned} = \frac{1}{2+\frac{1}{2+\frac{2}{3}}} \end{aligned}$$

$$\begin{aligned} = \frac{1}{2+\frac{1}{\frac{8}{3}}} \end{aligned}$$

$$\begin{aligned} = \frac{1}{2+\frac{3}{8}} \end{aligned}$$

$$\begin{aligned} = \frac{1}{\frac{19}{8}} \end{aligned}$$

$$\begin{aligned} = \frac{8}{19} \end{aligned}$$