A farmer divides his herd of $x$ cows among his four sons, so that the first son gets one-half the herd, the second one-fourth, the third son one-fifth and the fourth son $7$cows. Then the value of $x$ is _____.

In the following question, select the related letters from the given alternatives.

ADBC : EHFG : : ILJK : ?

In the following question, select the related word from the given alternatives.

Flexible : Rigid : : Confidence : ?

In the following question, select the related number from the given alternatives.

$1 : 8 : : 27 : ?$

In the question, a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

YX, UTS, ONML, ?

In the question, a series is given, with one term missing. Choose the correct alternative from the given ones that will complete the series.

$8, 15, 36, 99, 288, ?$