model 1 simple percentage questions Practice Questions Answers Test with Solutions & More Shortcuts

percentage PRACTICE TEST [11 - EXERCISES]

model 1 simple percentage questions

model 2 net increase or decrease in %

model 3 reducing & exceeding prices

model 4 x & y comparison

model 5 income & expenditure

model 6 consumption & remaining

model 7 marks scored in examinations

Model 8 population based

model 9 voters & election

model 10 percentage with allegations & mixture

model 11 percentage with ratios

percentage Important Formulas, Rules, Concepts & Shortcuts

Question : 16

A box has 100 blue balls, 50 red balls, 50 black balls. 25% of blue balls and 50% of red balls are taken away. Percentage of black balls at present is

a) 33$1/3$%

b) 40%

c) 50%

d) 25%

Shortcut »

Answer: (a)

After taking away respective balls,

Number of balls in the box = 75 + 25 + 50 = 150

Percentage of black balls = $50/150 × 100$

=$100/3 = 33{1}/3$%

Question : 17 [SSC CPO S.I. 2010]

32 is what per cent of 80 ?

a) 36%

b) 40%

c) 24%

d) 25.6%

Shortcut »

Answer: (b)

Required percentage = $32/80$ × 100 = 40%

Question : 18 [SSC CGL Prelim 2002]

If 20% of A = 50% of B, then what per cent of A is B ?

a) 25%

b) 15%

c) 30%

d) 40%

Shortcut »

Answer: (d)

20% of A = 50% of B

2A = 5B ⇒ A = ${5B}/2$

Let B is x % of A.

${5B}/2 × x/100$= B

x = $200/5$ = 40%

Question : 19

0.15% of 33$1/3$% of Rs.10000 is :

a) Rs.0.05

b) Rs.105

c) Rs.5

d) Rs.150

Shortcut »

Answer: (c)

0.15% of 33$1/3$% of Rs.10000

=$0.15/100 × 100/300 × 10000$= Rs.5

Question : 20

If 15% of (A + B) = 25% of (A – B), then what per cent of B is equal to A?

a) 200%

b) 400%

c) 10%

d) 60%

Shortcut »

Answer: (b)

15% of (A + B) = 25% of (A – B)

$15/100(A + B) = 25/100(A - B)$

15 (A + B) = 25 (A – B)

15 A + 15 B = 25A – 25 B

10 A = 40 B

A = 4 B

Now, let x% of B is equal to A

$x/100×B =A ⇒ x/100×B =4B$

x = 400%

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