GRE Questions

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A promise. 

The Promise made to somebody by you can be break but you cannot touch it.

For the given problem there are three possiblities.
Father's age can be = 36, 31, 29
Mother's age = 32, 27, 25
Son's age = 8, 3, 1.

By using only B it can be calculated.

It is The Wind which cries without a voice, flutters without wings, bites toothless and mutters mouthless.

"The moon smiled at me" is the example of personification in the given options.

Personification is a technique in which we give objects human traits like emotions, gestures, speech,... by using metaphor. 

Here moon is an object which cannot smile but using metaphor sense, we gave that sense to it.

The Riddle itself has the Answers.

What is a 4 letter word

Yet is written in 3 letters

Everything is written with 9 letters

Then with 4 letters

Rarely has 6 letters

Never is written in 5 letters.

Enforcing a penalty will motivate people to pay the bills. So, course of action a follows.
It is general tendency to act accordingly when a penalty clause slapped. So, course of action b follows.

Expressing 3/8 as a decimal fraction:

We can convert 3/8 into a decimal fraction by just dividing 3 by 8 or making 3 into 8 parts.

Then, it is 3/8 = 0.375 as a decimal fraction.

Other Method::

3/8 as a Decimal :

In this we should convert the denominator into 10, 100, 1000, 10000, 100000,... to make it simple.

Now to make 8 into 1000, we multiply numerator and denominator with 125

=> (3 x 125)/(8 x 125) = 375/1000 = 0.375.