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Friday, March 28, 2025

What will come in the place of the question mark '?' in the following question? 30% of 300 + 25 + 5 × 2% of 200 = ?

March 28, 2025 |

General Aptitude, Percentage, RRB NTPC Exam 27 Jan 2021, Solved

What will come in the place of the question mark '?' in the following question? 30% of 300 + 25 + 5 × 2% of 200 = ?

A12

B15

C23.6

D21.6

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Wednesday, March 19, 2025

In an organization, 40% of the employees are matriculates, 50% ofthe remaining are graduates and remaining 180 are post-graduates. How many employees are graduates ?

March 19, 2025 |

General Aptitude, Percentage, RRB Goods Guard Exam (Bhopal) 2008, Solved

In an organization, 40% of the employees are matriculates, 50% ofthe remaining are graduates and remaining 180 are post-graduates. How many employees are graduates ?

A360

B240

C180

D300

Akhilesh Mar 20 '25 at 21:00

Correct answer is: 180
Explanation: Let the total number of employees be $T$
- 40% of $T$ are matriculates: $0.4T$
- Remaining employees: $60\%$ of $T$ = $0.6T$
- 50% of these remaining employees are graduates: $0.5 \times 0.6T = 0.3T$
- The remaining 50% are post-graduates: $0.3T = 180$
- Solving for $T$ : $0.3T = 180$ → $T = 600$
- Therefore, the number of graduates is $0.3 \times 600 = 180$

OPTION a (360): Incorrect, as it does not match the calculated number of graduates.

OPTION b (240): Incorrect, as it does not match the calculated number of graduates.

OPTION c (180): Correct, as it matches the calculated number of graduates.

OPTION d (300): Incorrect, as it does not match the calculated number of graduates.

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Monday, January 20, 2020

The value of a machine depreciates at 10% per annum. If the current value of the machine is Rs. 81,000, what was the value of the machine two years ago?

January 20, 2020 |

General Aptitude, KPTCL Assistant Exam (Mescom) SLOT-2 2017, Percentage, Solved

The value of a machine depreciates at 10% per annum. If the current value of the machine is Rs. 81,000, what was the value of the machine two years ago?

ARs. 99,000

BRs. 1,00,000

CRs. 1,19,000

DRs. 1,08,000

rahul Jan 21 '2020 at 21:5

Correct answer is: Rs. 1,00,000

Explanation:

Value of machinery
1 year ago
$\frac{81,000}{90} \times 100 = 90,000$

2 year ago
$\frac{90,000}{90} \times 100 = 1,00,000$

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Tuesday, January 7, 2020

The length of a rectangle is increased by 60%. By what percent would the width have to be decreased to maintain the same area ?

January 07, 2020 |

Area, General Aptitude, Percentage, Ratio and Proportion, RRB ASSISTANT LOCO PILOT (Patna) 2013, Solved

The length of a rectangle is increased by 60%. By what percent would the width have to be decreased to maintain the same area ?

A37(1 / 2)%

B0.6

C0.75

DNone

rahul Jan 15 '2020 at 9:30

Correct answer is: $37 \frac{1}{2} \%$

Explanation:

Let original length = x and
original breadth = y.
Then, original area = xy

New length = $\frac{160x}{100} = \frac{8x}{5}$ .
Let new breadth = zThen. $\frac{8x}{5} \times z = xy => z = \frac{5y}{8}$
\therefore Decrease in breadth = $\Big(\frac{3y}{8} \times \frac{1}{y} \times 100 \Big) \% = 37\frac{1}{2}\%$

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Friday, January 3, 2020

If 40% of (x - y) = 30% of (x + y), then y = what percent of x

January 03, 2020 |

General Aptitude, KPTCL Assistant Exam (Mescom) SLOT1 2017, Percentage, Solved

If 40% of (x - y) = 30% of (x + y), then y = what percent of x ?

A70%

B 9.6%

C14.3%

D2.5%

rakesh Oct 18 '2017 at 21:35

Answer is : 14.3%

Explanation:

40% of (x - y) = 30% of (x + y)

$=>\frac{40}{100} of (x-y) = \frac{30}{100} of (x+y)$

$=> \frac{40}{100}\times (x-y) = \frac{30}{100}\times(x+y)$

$=> 4x - 4y = 3x+3y$

=> x = 7y

$\therefore \text{required percentage} =\Big(\frac{y}{x}\times100\Big)\%$

=> $\Big(\frac{y}{7y}\Big) \times 100 \%$

$=> \Big( \frac{100}{7} \Big) \%$

= 14.3%

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