16.
In a class 60% of students passed in telugu, 50% 0f students passde in english. Then if every student Passed in either telugu or english or both the subjects. Then what is the percentage of students passed In both the subjects?
Answer: Option 'A'
passed in Telugu = 60 %
passed in English = 50 %
only passed in telugu = 50%
only passed in english = 40%
the percentage of studebts passed in both the subjects = 10 %
17.
A mixture of 20 litres of milk and water contains 20% of water. The new mixture is formed by adding 5 lit of water. What is the percentage of milk in the new mixture?
Answer: Option 'C'
(20 li = 4 li water 16 li milk
-------- 5 li water
Total = 9 li water 16 li milk (new)
16/25×100=64%
18.
If 40% of a certain number is 120, then what is 90% of that number?
Answer: Option 'D'
40% = 40 × 3 = 120
90% = 90 × 3 = 270
19.
What percent is 70 of 280?
Answer: Option 'A'
70/280 = 1/4
1/4 × 100 = 25 %
20.
Express 3/4 as rate percent.
Answer: Option 'C'
3/4 × 100 = 300/4 % = 75 %
21.
If X,Y is 20%,30% smaller than Z then how much percentage is Y greater than X?
Answer: Option 'C'
X = 80 %
Y = 70 %
Z = 100 %
X-Y/X × 100 = 10/80 × 100 = 12 1/2 % greater than X
22.
The population of a town increases 10% and 20% respectively in two consecutive years. After the growth the present population of the town is 13200. Then what is the population of the town 2 years ago?
Answer: Option 'C'
Formula :
( After =100 denominator
Ago = 100 numerator)
13200 × 100/110 × 100/120 = 10000
23.
If A is 25% greater than B then how much percentage is B smaller than A?
Answer: Option 'A'
A = 125
B = 100
A-B/A × 100 = 25/125 × 100 = 20 % smaller smaller than A
24.
In an election between the two candidates ,The candidates who gets 60% of votes polled is winned by 280 votes majority. What is the total number of votes polled?
Answer: Option 'B'
Note : majority (20 %) = difference in votes polled to win (60 %) & defeated candidates (40 %)
20 % = 60 % - 40 %
20% -----> 280 (20×14 = 280 )
100% -----> 1400 (100×14 = 1400)
25.
If 20% of a certain number is 80, then what is 30% of that number?
Answer: Option 'B'
20% = 20 × 4 = 80
30% = 30 × 4= 120
26.
The population of a town is 8000. It decreases annually at the rate of 20% p.a. What will be its population after 2 years?
Answer: Option 'B'
Formula :
( After =100 denominator
Ago = 100 numerator)
8000 × 80/100 × 80/100 = 5120
27.
The population of a town is 8100. It decreases annually at the rate of 10% p.a. What was its population 2 years ago?
Answer: Option 'C'
Formula :
( After =100 denominator
Ago = 100 numerator)
8100 × 100/90 × 100/90 = 10000
28.
The Shopkeeper increased the price of a product by 25% so that customer finds it difficult to purchase the required amount. But somehow the customer managed to purchase only 70% of the required amount. What is the net difference in the expenditure on that product?
Answer: Option 'C'
Quantity X Rate = Price
1 x 1 = 1
0.7 x 1.25 = 0.875
Decrease in price = (0.125/1) × 100 = 12.5%
29.
Two employees X and Y are paid a total of Rs. 550 per week by their employer. If X is paid 120 percent of the sum paid to Y, how much is Y paid per week?
Answer: Option 'C'
Let the amount paid to X per week = x
and the amount paid to Y per week = y
Then x + y = 550
But x = 120% of y = 120y/100 = 12y/10
∴12y/10 + y = 550
⇒ y[12/10 + 1] = 550
⇒ 22y/10 = 550
⇒ 22y = 5500
⇒ y = 5500/22 = 500/2 = Rs.250
30.
If 20% of a = b, then b% of 20 is the same as:
Answer: Option 'C'
20% of a = b
=> b = 20/100a
b% of 20 = (b/100)20 = [(20/100a)/100]20
= (20 × 20 × a)/(100 × 100)
= 4a/100 = 4% of a