Uses of Ratios and Proportions

Q.

The ratio of a dozen to a score is

1. $2:15$

2. $3:5$

3. $4:5$

4. $5:2$

Q.

The ratio of weights of zinc and copper in an alloy is $5:8$. If the weight of copper in a sample of this alloy is $10.4g$, what is the weight of zinc?

1. $6.5g$
2. $6g$
3. $7g$
4. $7.5g$

Q. Mr. Vijay is 42 years old and his son is 14 years old. Determine the ratio of the father's age to that of son's age when the son was 12 years old.

1. 28 : 12
2. 10 : 3
3. 12 : 40
4. 3 : 10

Q.

Divide $₹1650$ among $A,B$and $C$ in the ratio $3:5:7$

Q. Alex plays the game from 10:30 AM to 5:30 PM. In between, he spends 30 minutes for lunch. Find the ratio of hours spent on game to the time spent on lunch.​

Q. The ratio of zinc and copper in an alloy is 9:8. If the weight of copper, in the same alloy, is 120 kg, find the weight of zinc in the alloy.

Q. The daily sale of kerosene ( in liters ) in a ration shop for six days is as follows:
$75,120,12,50,70.5$ and $140.5$
The average daily sale is

1. $150$
2. $10$
3. $142$
4. $78$

Q. Total population of a city is 8000, out of which 6000 are males. What percentage of the total population are males (in %)?

1. 75

Q.

Find $x$ if $₹2:₹25$ : : $5\mathrm{cm}$ : $\mathrm{x}$

1. $625\mathrm{cm}$

2. $6.25\mathrm{cm}$

3. $62.5\mathrm{cm}$

4. $0.625\mathrm{cm}$

Q.

The product of two numbers is 2.73. If one of them is 1.3, then what is the other number?

Q.

Alex plays the game from 3:30 PM to 5:30 PM. In between, he spends 30 minutes for lunch. Find the ratio of hours spent on game to the time spent on lunch.

Q.

Of the $288$ persons working in a company, $112$ are men and the remaining are women. Find the ratio of the number of men to the total number of persons.