What is the word or phrase?

I am looking for a word that change both gender and number when i add the letter 'S'.

What Word am I Looking For ?

Find the next number in the series.
1 10 24 43 67 ?

A car meter reading shows 72927 miles a palindromic number.
what is the minimum number of miles you would need to travel to see another palindromic number on the car meter reading?

A man had five children. He had $100 with him to give to his children. He decided to start with the youngest child and then give $2 more than each younger child to his next elder child.

For example, if he gives $x to the youngest child, he will give $(x+2) to the next one, $[(x+2) + 2] to the next one and so on.

Can you find out how much did the youngest one receive?

What does a man do only once in his lifetime, but women do once a year after they are 29?

There are two candles. Both will only burn exactly for an hour. How will you use these two candles to measure forty-five minutes?

Which three-digit number, made of consecutive digits, like 567, is 2 less than a cube and 2 more than a square?

There is an English word that can be used up to four times in a row without modifying the spelling and form a valid grammatical sentence.

Do you know what word is that?

What month of the year has 28 days?