### Question 1.

**From a container having pure milk, 20% is replaced by water and the process is repeated thrice. At the end of the third operation, the milk is:**

**(a)**40% Pure

**(b)**50% Pure

**(c)**51.2% Pure

**(d)**58.8% Pure

### Question 2.

**300 grams of sugar solution has 40% sugar in it. How much sugar should be added to make it 50% of the solution?**

**(a)**10 gms

**(b)**40 gms

**(c)**60gms

**(d)**80 gms

### Question 3.

**The price of an article is out by 20%. to restore it to the former value, the new price must be increased by**

**(a)**20%

**(b)**25%

**(c)**16

^{2}/

_{3}%

**(d)**24%

### Question 4.

**In an Examination, A got 10% maks less than B,B got 25% marks more than C and C got 20% less and D. If A got 360 marks out of 500, the percentage of marks obtained by D was:**

**(a)**70

**(b)**80

**(c)**75

**(d)**85

### Question 5.

**Arvind spends 75% of his income. His income is increased by 20% and he increased his expenditure by 10%. His saving is increased by:**

**(a)**10%

**(b)**25%

**(c)**37

^{1}/

_{2}%

**(d)**50%

### Question 6.

**The price of sugar is increased by 20%. As a result, a family decreases its consumption by 25%. The expenditure of the family on sugar will be decreased by:**

**(a)**10%

**(b)**5%

**(c)**14%

**(d)**15%

### Question 7.

**A building worth Rs. 133,100 is constructed on land worth Rs. 72,900. After how many years will the value of both be the same if land appreciates at 10% pa. and building depreciates at 10% pa.?**

**(a)**2.5

**(b)**2

**(c)**1.5

**(d)**3

### Question 8.

**Salaries of A, B and C are in the ratio 1:2:3. Salary of B and C together is Rs. 6000. By what percent is salary of C more than that of A?**

**(a)**300

**(b)**600

**(c)**100

**(d)**200

### Question 9.

**The length of a rectangle is increased by 60% By what percent would the width have to be decreased to maintain the same area?**

**(a)**37

^{1}/

_{2}%

**(b)**60%

**(c)**75%

**(d)**None of these

### Question 10.

**For a sphere of radius 10 cm, the numerical value of ty surface area is what percent of the numerical value of its volume?**

**(a)**24%

**(b)**26.5%

**(c)**30%

**(d)**45%

###
**Question 11.**

**The difference between a discount of 35% and two successive discous discount of 20% and 20% on a certain bill was Rs. 22. Find the amount of the bill.**

**(a)**Rs. 3200

**(b)**Rs. 2200

**(c)**Rs. 1800

**(d)**None of these

###
**Question 12.**

**Two shopkeepers sell a radio or similar brand and type at the same list price of Rs. 1000. The first allows two successive discount of 20% and 10% and the second allows the successive discount of 15% and 15%. Find the difference in discounts offered by the two shopkeepers**

(a)Rs. 3.50

(a)

**(b)**Rs. 1.50

**(c)**Rs. 2.50

**(d)**None of these

###
**Question 13.**

**The tax on a commodity is diminished by 10% and its consumption increases by 10%. Find the effects on revenue**

**(a)**1%

**(b)**2%

**(c)**3%

**(d)**None of these

###
**Question 14.**

**The radius of a sphere is increased 10%. The surface area increases by**

(a)21%

(a)

**(b)**31%

**(c)**41%

**(d)**None of these

###
**Question 15.**

**If the side of a square is increased by 30%, its area is increased by**

(a)49%

(a)

**(b)**69%

**(c)**79%

**(d)**None of these

###
**Question 16.**

**In measuring the sides of a rectangle, one side is taken 10% in excess and the other 20% in deficit. Find the error percent in area calculated from the measurement**

(a)12% deficit

(a)

**(b)**10% deficit

**(c)**12% excess

**(d)**None of these

###
**Question 17.**

**Water tax is increased by 20% but itsconsumptiono is decreased by 20%. The increase or decrease in the expenditure is**

**(a)**4% decrease

**(b)**4% increase

**(c)**8% decrease

**(d)**8% increase

###
**Question 18.**

**The population of a city increases at the rate of 10% annually. Its present population is 90.51 lacs. The population 3 years ago was nearly**

(a)72 lacs

(a)

**(b)**68 lacs

**(c)**80 lacs

**(d)**None of these

###
**Question 19.**

**The value of a machine is Rs. 6250. It decreases by 10% during the first year, 20% during the second year and 30% during the third year. What will be the value of the machine after 3 years?**

(a)Rs. 2650

(a)

**(b)**Rs. 3050

**(c)**Rs. 3150

**(d)**None of these

###
**Question 20.**

**An army lost 10% its men in war, 10% of the remaining due to diseases and 10% of the rest were disabled. Thus, the strength was reduced to 729000 active men. Find the original strength.**

(a)1000000

(a)

**(b)**1200000

**(c)**1500000

**(d)**None of these

## Solutions

### Ans. 1 (C)

Let the total quantity of original milk= 1000gm.Milk after first operation = 80% of 100= 800gm

Milk after second operation = 80% of 800= 840gm.

Milk after third operation = 80% of 640 = 512 gm

∴ Strength of final mixture = 51.2%