611. There were two candidates in an election. Winner candidate received 62% of votes and won the election by 288 votes. Find the number of votes casted to the winning candidate?
A. 456
B. 744
C. 912
D. 1200

Explanation:
W = 62% L = 38%
62% – 38% = 24%
24% ——– 288
62% ——– ? => 744

612. If population of certain city increases at the rate of 5%. If population in 1981 was 138915, then population in 1978 was__________?
A. 1,20,000
B. 1,10,000
C. 1,00,000
D. 90,000

Explanation:
X * (105/100) * (105/100) * (105/100) = 138915
X = 138915/1.157625
X = 120000

613. At an examination in which full marks were 500. A got 10% less than B, B got 25% more than C and C got 20% less than D. If A got 360 marks, what percentage of full marks was obtained by D?
A. 70%
B. 90%
C. 80%
D. 75%

Explanation:
A B C D
90 100 80 100
A D
90 —– 100
360 —— ? = 400
500 —— 400
100 ——- ? => 80%

614. The tax on a commodity is diminished by 20% but its consumption is increased by 10%. Find the decrease percent in the revenue derived from it?
A. 20%
B. 18%
C. 15%
D. 12%

Explanation:
100 * 100 = 10000
80 * 110 = 8800
10000——- 1200
100 ——- ? = 12%

615. The amount of water (in ml) that should be added to reduce 9 ml. Lotion, containing 50% alcohol, to a lotion containing 30% alcohol, is__________?
A. 3
B. 4
C. 5
D. 6

Explanation:
4.5 4.5
30% 70%
30% —– 4.5
70% ——? => 10.5 – 4.5 = 6 ml

616. A mixture of 70 liters of wine and water contains 10% water. How much water must be added to make water 12 ½% of the total mixture?
A. 12 liters
B. 10 liters
C. 4 liters
D. 2 liters

Explanation:
70 * (10/100) = 7
Wine Water
87 1/2% 12 1/2%
87 1/2% ——- 63
12 1/2% ——-? => 9-7=2

617. In a factory, there are 40% technicians and 60% non-technicians. If the 60% of the technicians and 40% of non-technicians are permanent employees, then the percentage of workers who are temporary is________?
A. 32%
B. 42%
C. 52%
D. 62%

Explanation:
Total = 100
T= 40 NT= 60
40*(60/100)=24 60*(40/100)=24
24 + 24 = 48 => 100 – 48 = 52%

618. 5% people of a village in Sri Lanka died by bombardment, 15% of the remainder left the village on account of fear. If now the population is reduced to 3553, how much was it in the beginning?
A. 3800
B. 4200
C. 4400
D. 5500

Explanation:
X * (95/100) * (85/100) = 3553
X = 4400

619. A salesman’s terms were changed from a flat commission of 5% on all his sales to a fixed salary of Rs.1000 plus 2.5% commission on all sales exceeding Rs. 4,000. If his remuneration as per new scheme was Rs. 600 more than that by the previous schema, his sales were worth?
A. Rs. 14,000
B. Rs. 12,000
C. Rs. 30,000
D. Rs. 40,000

Explanation:
[1000 + (X-4000) * (2.5/100)] – X * (5/100) = 600
X = 12000

620. A and B’s salaries together amount to Rs. 2,000. A spends 95% of his salary and B spends 85% of his. If now their savings are the same, what is A’s salary?
A. Rs.500
B. Rs.750
C. Rs.1250
D. Rs.1500

Explanation:
(5/100) A = (15/100) B
A = 3B
A + B = 2000
4B = 2000 => B = 500
A = 1500