Percentage

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31 What is the minimum quantity of milk in Litres that should be mixed in a mixture of 60 liters in which the initial ratio of milk to water is 1:4 such that the resulting mixture has 15 % milk?

A
5 liters
B
50 liters
C
15 liters
D
Inadequate Data

32 A person's salary was decreased by 20%. By what per cent should the salary be increased in order to obtain his original salary?

A
25%
B
30%
C
20%
D
35%

33 The salary of a worker is first increased by 5% and then it is decreased by 5%. What is the change in his salary?

A
Increase 0.25%
B
Decrease 0.25%
C
Increase 25%
D
Decrease 25%

34 53 percent of a number is 358 less than the square of 26. What is the value of three-fourth of 23 percent of that number?

A
20%
B
25%
C
23%
D
33%

35 Rajesh had a certain amount with him. He spent 20% of that to buy a new mobile and 15% of the remaining on buying a DSLR. Then he donated ₹ 160 in a trust. If he is left with ₹ 1,200, how much did he buy the DSLR for?

A
₹ 140
B
₹ 240
C
₹ 340
D
₹ 250

36 In a School x % student of class 10 passed the exam, y % of the passed student are girls and z% of the fail students are boys. Find the percentage of passed boys over the failed girls is:

A
100(100 - z)x / [(100 - y)(100 - z)]
B
100(100 - y)x / [(100 - x)(100 - z)]
C
100(100 - z)x / [(100 - x)(100 - y)]
D
100(100 - y)x / [(100 - x)(100 - y)]

37 In an examination, Mamali scored 45% marks and failed by 18 marks. In the same examination, Monali scored 54% marks and get 27 marks more than the passing marks. What is the score of Snigdha in the same examination, who secured 75 %?

A
355
B
365
C
375
D
385

38 A mixture of 20 litres contains 20% alcohol and the rest is water. The percentage of alcohol in the new mixture will be if 4 litres of water is added to it.

A
15($$\frac{2}{3}$$)%
B
16($$\frac{2}{3}$$)%
C
17($$\frac{2}{3}$$)%
D
18($$\frac{2}{3}$$)%

39 To pass a exam, Biky must get a score of 40%. What was the maximum score he could have gotten if he got 185 and failed by 15 marks?

A
500
B
300
C
400
D
600

40 Ciky earns 22 % of his investment. If he earns ₹ 187, then how much he had invested?

A
820
B
830
C
850
D
840