Estimation Using Percentages in Situations

Q. A mixture of 70 litres of wine and water contains $10\%$ of water. How much water must be added to make the water content $12.5\%$ of the resulting mixture?

1. 1 litre
2. 4 litre
3. 2 litre
4. 3 litre

Q. A large watermelon weighs 20 kg and 96% of its weight is water. When it is kept in the sun, due to evaporation of water, it was observed that now, 95% of its weight is water. What is the reduction in the weight of the watermelon?

1. 18 kg
2. 17 kg
3. 16 kg
4. 16.5 kg

Q.

How many litres of pure acid is there in 8 litres of a 20% solution?

1. 1.6

2. 1.7

3. 1.8

4. 1.5

Q. The monthly salary of Rohit is $Rs.24,000$. If his salary increases by $12\%$, find his new monthly salary.

Q. Express :
$700gm$ as a percentage of $2.8kg$.

Q. What percent of the figure is colored in the given figure?

1. $80\%$
2. $70\%$
3. $50\%$
4. $60\%$

Q.

Decrease $300$ by $30\%$.

Q. Certain volume of water is needed to wash biodiesel. This is represented by the equation y = 4.25 x , where y is the volume of diesel in gallons and x is the volume of water required in gallons. What is the value of x, when y is 21.25 gallons?

1. 4 gallons
2. 5 gallons
3. 2 gallons
4. 3 gallons

Q. The population of a city is 155625, for every 1000 men, there are 1075 women. If $40\%$ of men and $24\%$ of women be literate, then what is the percentage of literate people in the city?

1. $32\frac{10}{15}\%$
2. $31\frac{59}{83}\%$
3. $30\%$
4. $32\%$

Q. A large watermelon weighs 20 kg and 96% of its weight is water. When it is kept in the sun, due to evaporation of water, it was observed that now, 95% of its weight is water. What is the reduction in the weight of the watermelon?

1. 18 kg
2. 17 kg
3. 16.5 kg
4. 16 kg

Q. A tank contains 75.57 litres of water. If Ramu uses 27.34 litres of water to wash his car, then how much water is left in the tank?

Q. A mixture of 70 litres of wine and water contains $10\%$ of water. How much water must be added to make the water content $12.5\%$ of the resulting mixture?

1. 1 litre
2. 2 litre
3. 3 litre
4. 4 litre

Q.

Express $\frac{45}{135}$ as a percentage.

1. 35%

2. 25%

3. 33.33%

4. 40%

Q. Express the first quantity as a percent of the second :
$42$ seconds, $6$ minutes

Q. Find the value of following :
$15\%$ of $2$ minutes [2 Marks]

Q.

If the price of milk increases from 24 rupees per litre to 32.40 per litre, then the percentage increase in the price is equal to

1. 25%

2. 45%

3. 15%

4. 35%

Q. What percentage of $200$ is $20?$

1. $15$
2. $5$
3. $10$
4. $20$