Question 1 :
Cost of pure milk is Rs. $16$ per liter. On adding water, the mixture is sold at Rs. $15$ per liter. In this way, the milkman earns $25\ %$ profit. What is the ratio of milk and water in the mixture?

Question 2 :
Trees are to be planted inside a circular tree orchard so that there are $5$ trees per square meter. The circumference of the tree orchard is $30$ meters. If trees are available only in allotments of packages of $6$, how many allotments will the caretaker need to purchase?

Question 3 :
If $x : y = 5 : 2$ and $y : z = 3 : 2$, what is the ratio of $x : z$?

Question 4 :
Divide $Rs.370$ into three parts such that second part is  $\dfrac{1}{4}$ of the third part and the ratio between the first and the third part is $3:5$. Find each part.

Question 5 :
If the weight of $5$ bags of rice is $272\ kg$, then the weight of $1$ bag of rice is

Question 6 :
The boys and girls in a college are in the ratio $3:2$. If $20\%$ of the boys and $25\%$ of the girls are adults, the percentage of students who are not adults is?

Question 7 :
One year payment of the servant is  one shirt and $Rs.200$ . The servant leaves after $9$ months and receives $Rs.120$ and a shirt. What is the price of the shirt?

Question 8 :
The population of a bacteria culture doubles in number every 12 minutes. the ratio of the number of bacteria at the end of 1 hour to the number of bacteria at the beginning of that hour is

Question 9 :
If three numbers in the ratio $3:2:5$ be such that the sum of their squares is $1862$, the middle number will be

Question 10 :
Rs. $3200$ is divided among $A, B$ and $C$ in the ratio of $3:5:8$ respectively. What is the difference (in Rs.) between the share of $B$ and $C$?

Question 11 :
Nate walks $25$meters in $13.7$ seconds. If he walks at this same rate, which of the following is closest to the distance he will walk in $4$ minutes?

Question 12 :
<table class="wysiwyg-table"><tbody><tr><td>Age</td><td>Male</td><td>Female</td><td>Total</td></tr><tr><td>$0-18$ year old</td><td>$56$</td><td>$50$</td><td>$106$</td></tr><tr><td>$19-40$ years old</td><td>$108$</td><td>$90$</td><td>$198$</td></tr><tr><td>$41-65$ years old</td><td>$126$</td><td>$135$</td><td>$261$</td></tr><tr><td>$66+$ years old</td><td>$90$</td><td>$96$</td><td>$185$</td></tr><tr><td>Total</td><td>$380$</td><td>$370$</td><td>$750$</td></tr></tbody></table>The age of a random sample of people from a population is summarized in the table above. The whole population consists of $31,000$&#160;people. Mark the correct statement.