In a group of ducks and buffaloes, the total number of legs are 24 more than twice the number of heads. Find the total number of buffaloes.

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 A

Explanation:

$$\begin{aligned} => \frac{4}{7}x + \frac{4}{7} = \frac{15}{4} \end{aligned}$$
$$\begin{aligned} = \frac{4}{7}x = \frac{15}{4} - \frac{4}{7} \end{aligned}$$
$$\begin{aligned} = \frac{4}{7}x = \frac{7}{14} \end{aligned}$$
$$\begin{aligned} = x = \frac{1}{2}\times \frac{7}{4} = \frac{7}{8} \end{aligned}$$

Answer: Option D

Answer: Option A

Explanation:

After applying BOMAS rule,
First Multiplication will be done then addition
So it will be 100 + 100 = 200

Answer: Option D