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

What Word am I Looking For ?

What four weights can be used to balance from 1 to 30 pounds?

Jack have ten pairs of black socks, eight pairs of white socks and seven pairs of green socks. Everything is mixed in a draw. As there is no light he were not able to identify the colour of the socks. How many of the socks did he want to take to match one pair

You have a basket containing ten apples. You have ten friends, who each desire an apple. You give each of your friends one apple.
Now all your friends have one apple each, yet there is an apple remaining in the basket.
How?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Find the number of squares in the below picture

The more of this there is, the less you see. What is it?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

A journalist was investigating a sacred cult in the jungles of Africa when he was caught by one of the person. He was confined in a cave till the leader arrived. The leader told him that he need to tell him a statement. If he thinks the statement is true, then the journalist head will be chopped off. If he thinks that the statement is false, his head will be smashed with a hammer.

What statement did the journalist make to survive?