If there is inequality in the pattern of population growth, there is greater inequality in food production and utilisation. As societies become wealthier, their consumption of animal products increases. This means that a greater proportion of such basic foodstuff as grains and legumes that could feed humans directly is instead being converted into feed for poultry and large farm animals. Yet this conversion of plant-based food into animal food for humans is far from efficient. Only $16 \%$ of the calories fed to chickens are recovered by us when we eat them. This conversion rate goes down to five to seven per cent in large animals that are fed grain to add fat and some protein before slaughter.

If $\mathbf{P}=+, \mathbf{Q}=-, \mathbf{R}=\times, \mathbf{S}=\div$, then insert the proper notations between the successive numbers in the equation $60 \_15 \_3 \_20 \_4=20$ :

In only 50 years, the world's consumption of raw materials has nearly quadrupled, to more than 100 billion tons. Less than $9 \%$ of this is reused. Batteries of old vehicles contain materials such as lithium, cobalt, manganese and nickel that are pricey and can be hard to obtain. Supply chains are long and complicated. Buyers' risks are being aggravated by their suppliers' poor environmental and labour standards. Reusing materials makes sense. Once batteries reach the ends of their lives, they should go back to a factory where their ingredients can be recovered and put into new batteries.

A mobile phone has been stolen. There are 3 suspects $P$, $\mathbf{Q}$ and $\mathbf{R}$. They were questioned knowing that only one of them is guilty. Their responses are as follows:

P: I did not steal. Q stole it.

Q: R did not steal. I did not steal.

R: I did not steal. I do not know who did it.

Who stole the mobile phone?

In only 50 years, the world's consumption of raw materials has nearly quadrupled, to more than 100 billion tons. Less than $9 \%$ of this is reused. Batteries of old vehicles contain materials such as lithium, cobalt, manganese and nickel that are pricey and can be hard to obtain. Supply chains are long and complicated. Buyers' risks are being aggravated by their suppliers' poor environmental and labour standards. Reusing materials makes sense. Once batteries reach the ends of their lives, they should go back to a factory where their ingredients can be recovered and put into new batteries.

Three teams $\mathbf{P}, \mathbf{Q}, \mathbf{R}$ participated in a tournament in which the teams play with one another exactly once. A win fetches a team 2 points and a draw 1 point. A team gets no point for a loss. Each team scored exactly one goal in the tournament. The team $\mathbf{P}$ got $\mathbf{3}$ points, $\mathbf{Q}$ got 2 points and R got 1 point. Which of the following statements is/are correct?

I. The result of the match between $P$ and $Q$ is a draw with the score 0-0.

II. The number of goals scored by R against Q is 1 .

Which of the statements given above is/are correct?

"A good statesman, like any other sensible human being, learns more from his opponents than from his fervent supporters. For his supporters will push him to disaster unless his opponents show him where the dangers are. So if he is wise he will often pray to be delivered from his friends, because they will ruin him. But, though it hurts, he ought also to pray never to be left without opponents; for they keep him on the path of reason and good sense. The national unity of free people depends upon a sufficiently even balance of political power to make it impracticable for the administration to be arbitrary and for opposition to be revolutionary and irreconcilable."

$P$ is the brother of $Q$ and R. S is R's mother. T is P's father. How many of the following statements are definitely true?

I. S and T are a couple.

II. Q is T's son.

III. T is Q's father.

IV. S is P's mother.

V. R is T's daughter.

VI. P is S's son.

Select the correct answer using the code given below: