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Q:

The ratio between the length and the breadth of a rectangular park is 3 : 2. If a man cycling along the boundary of the park at the speed of 12 km/hr completes one round in 8 minutes, then the area of the park (in sq. m) is:

A) 15360	B) 153600
C) .30720	D) 307200

Answer & Explanation Answer: B) 153600

Explanation:

Perimeter = Distance covered in 8 min. = (12000/60) * 8 = 1600m

Let length = 3x metres and breadth = 2x metres.

Then, 2(3x + 2x) = 1600 or x = 160.

Length = 480 m and Breadth = 320 m.

Area = (480 x 320) = 153600

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Filed Under: Volume and Surface Area

Q:

If the ratio of the ages of two friends A and B is in the ratio 3 : 5 and that of B and C is 3 : 5 and the sum of their ages is 147, then how old is B?

A) 27 Years	B) 75 Years
C) 45 Years	D) 49 Years

Answer & Explanation Answer: C) 45 Years

Explanation:

The ratio of the ages of A and B is 3 : 5.
The ratio of the ages of B and C is 3 : 5.

B's age is the common link to both these ratio. Therefore, if we make the numerical value of the ratio of B's age in both the ratios same, then we can compare the ages of all 3 in a single ratio.

The can be done by getting the value of B in both ratios to be the LCM of 3 and 5 i.e., 15.

The first ratio between A and B will therefore be 9 : 15 and
the second ratio between B and C will be 15 : 25.

Now combining the two ratios, we get A : B : C = 9 : 15 : 25.

Let their ages be 9x, 15x and 25x.
Then, the sum of their ages will be 9x + 15x + 25x = 49x

The question states that the sum of their ages is 147.
i.e., 49x = 147 or x = 3.

Therefore, B's age = 15x = 15*3 = 45

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Filed Under: Ratios and Proportions
Exam Prep: GRE

Q:

When do you use :: Operator in C++?

Answer

:: is the scope resolution operator. When local variable and global variable are having same name, local variable gets the priority. C++ allows flexibility of accessing both the variables through a scope resolution operator

Workspace

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Subject: Java

Q:

The principal that amounts to Rs.4913 in 3 years at $4 \frac{1}{3}$ % per annum compound interest compounded annually is

A) Rs.3096	B) Rs.4076
C) Rs.4085	D) Rs.4096

Answer & Explanation Answer: D) Rs.4096

Explanation:

principal = $A = 4913, T = 3, R = 4 \frac{1}{3}$

$P = {\frac{A}{(\frac{1 + R}{100})}}^{T}$

= Rs.4096

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Filed Under: Compound Interest
Exam Prep: GRE

Q:

Should government jobs in rural areas have more incentives

Arguments:

1. Yes. Incentives are essential for attracting government servants there

2. No. Rural areas are already cheaper,healthier and less complex than big cities .So,why offer extra incentives!

A) Only 1 is true	B) Only 2 is true
C) Either 1 or 2 is true	D) Neither 1 or 2 is true

Answer & Explanation Answer: A) Only 1 is true

Explanation:

Government jobs in rural are underlined with several difficulties in love of these .In lieu of these ,extra incentives are needed

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Filed Under: Statement and Arguments
Exam Prep: GRE

Q:

Should a total ban be put on traping wild animals?

Arguments:

1. Yes. Trappers are making a lot of money
2. No. Bans on hunting and trapping are not effective

A) Only 1 is true	B) Only 2 is true
C) Either 1 or 2 is true	D) Neither 1 or 2 is true

Answer & Explanation Answer: D) Neither 1 or 2 is true

Explanation:

Ban is necessary to protect our natural envoirnment .So none of the argument is strong enough

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Filed Under: Statement and Arguments
Exam Prep: GRE

Q:

Should students take part in politics?

Arguments:

1. Yes. It includes in the the quality of leader ship

2. No. They should study and build up their career

A) Only 1 is true	B) Only 2 is true
C) Either 1 or 2 is true	D) Neither 1 or 2 is true

Answer & Explanation Answer: C) Either 1 or 2 is true

Explanation:

Clearly ,indulgement in politics trains the students for future leader ship but it sways them from studies .So,either of argument 1 or 2 holds

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Filed Under: Statement and Arguments
Exam Prep: GRE

Q:

All windows are doors. No door is wall

Conclusions:

1. No window is wall

2. No Wall is door

A) Only 1 follows	B) Only 2 follows
C) Either 1 or 2 follows	D) Both 1 and 2 follow

Answer & Explanation Answer: D) Both 1 and 2 follow

Explanation:

Since both the premises are universal and one premise is negative, the conclusion must be universal negative. Also, the conclusion should not contain the middle term. So, 1 follows.

However, 2 is the converse of the second premise and thus it also holds.

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Filed Under: Statement and Conclusions
Exam Prep: GRE

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