41. Water tax is increased by 20% but its consumption is decreased by 20%. Then, the increase or decrease in the expenditure of the money is?
Answer:
Explanation:Assume total amount is 100
Increased tax = 100+20 = 120
Decrease in consumption = 100-20 =80
Total amount, 100*100 = 10000
After change, 120*80 = 9600
(10000-9600/10000)*100 = 4 % decrease
Workspace
HCL Technologies
42. Find the last non-zero digit of 30^2345
Answer:
Explanation:30^2345=(3*10)^2345=3^2345*10^2345
so 30^2345 has 2345 zeroes,the last non-zero digit of 30^2345 will be same as unit digit of 3^2345
3^2345=3^(4*586+1)=> 3^1=3
last non-zero digit of 30^2345= 3
Workspace
HCL Technologies
43. The ratio of the present ages of Sunita and vinita is 4:5. Six years hence the ratio of their ages will be 14:17. What will be the ratio of their ages 12 years hence?
Answer:
Explanation:present age sunita:vinita=4:5
lets their age is 4x and 5y respectively..
after 6 yrs their age ratio will be 14:17
therefore (4x+6)/(5x+6)=14/17
=>x=9
therefore their present age is 36,45 repectvely
after 12 yrs their age will be 48,57 respectively
=>ratio after 12 yrs will be 48/57=16/19=16:19
Workspace
HCL Technologies
44. In an examination, 35% of the students passed and 455 failed. How many students appeared for the examination?
Answer:
Explanation:Total no of students failed = 65% (100-35% who passed)
so, 455/65=7, which is equal to 1% of total strength.
Total no of students passed is 35%, So
7*35=245.
So Total Students is equal to
245+455= 700.
Workspace
HCL Technologies
45. The manufacturer of a certain item can sell all he can produce at the selling price of Rs. 60 each. If costs him Rs. 40 in materials and labour to produce each item and he has overhead expenses of Rs. 3000 per week in order to operate the plant. The number of units he should produce and sell in order to make a profit of at least Rs. 1000 per week, is :
Answer:
Explanation:let x be total items/week,
SP will be 60x,
CP will be [40x+4000(extra 1000 for profit )]
so,
40x+4000=60x
20x=4000
x=200.
Workspace
HCL Technologies
46. What is the angle between the hands of a clock when time is 8:30?
Answer:
Explanation:Clock has total 12 slots
Each slot==360/12=30 degree
Now at 8:30, total slots covered = 2.5
angle=2.5*30=75
Workspace
Wipro NLTH HCL Technologies
47. A and B are partners in a business. A contributes 1/4 of the capital for 15 months and B received 2/3 of the profit .For how long B’s money was used.
Answer:
Explanation:B received 2/3 of the profit
A : B = 1 : 2
Let the total capital = x
Then A's capital = x/4
B's capital = x – x/4 = 3x/4
Assume B's money was used for b months
Then A:B = (x/4)*15 : (3x/4)*b = 1 : 2
15/4 : 3b/4 = 1 : 2
15 : 3b = 1 : 2
5 : b = 1 : 2
5/b = 1/ 2
b = 5*2 = 10 months
Workspace
HCL Technologies Broadcom Ltd
48. In seven given numbers,the average of first four numbers is 4 and that of last four numbers is also 4. If the average of these seven numbers is 3, the fourth number is?
Answer:
Explanation:let 7 numbers are a,b,c,d,e,f,g.
given avg of first 4 nums are 4...i.e (a+b+c+d)/4=4
a+b+c+d=16
given avg of last 4 nums are also 4..i.e.(d+e+f+g)/4=4
d+e+f+g=16
e+f+g=16-d
given avg of 7 nums are 3....i.e (a+b+c+d+e+f+g)/7=3
a+b+c+d+e+f+g=21
16+16-d=21
d=32-21
d=11
Workspace
MindTree HCL Technologies Broadcom Ltd
49. 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 :
Answer:
Explanation:let total students will be 100 divide it in 3:2 =60/40
20 % 60=12 boys adult
25 % 40= 10girls adults
total adults = 22
no of students =100
100-22=78
78% are non adult
Workspace
MindTree HCL Technologies Broadcom Ltd
50. What was the day of the week on 12th January, 1979?
Answer:
Explanation:First Split the given date:1978 + 12th january 1979
1978=1600+300+78
1600years has 0 odd days
300years has 1 odd days
In 78 years has a 19 leap years and 59 nonleap years.
19*2=38
59*1=59
In january has 12 odd days
so total odd days are=1+38+59+12=110
110%7=5(remainder)
so 5->Friday
Workspace
HCL Technologies Broadcom Ltd
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